Question Missing usernames in frontend after update 5.1.0

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htaccess: Exists | PHP environment: Max execution time: 300 seconds | Max execution memory: 192M | Max file upload: 50M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
595	noch Fragen?	hauptmenu	view=home&defaultmenu=595	auswandern/noch-fragen	No
596	Forum	hauptmenu	view=category&catid=0&layout=list	auswandern/noch-fragen/forum	No
597	Recent Topics	hauptmenu	view=topics&layout=default&mode=replies	auswandern/nochfragen/recent	No
598	New Topic	hauptmenu	view=topic&layout=create	auswandern/noch-fragen/newtopic	No
599	No Replies	hauptmenu	view=topics&layout=default&mode=noreplies	auswandern/noch-fragen/noreplies	No
600	My Topics	hauptmenu	view=topics&layout=user&mode=default	auswandern/noch-fragen/mylatest	No
601	Profile	hauptmenu	view=user	auswandern/noch-fragen/profile	No
602	Rules	hauptmenu	view=misc	auswandern/noch-fragen/rules	No
603	Help	hauptmenu	view=misc	auswandern/noch-fragen/help	No
604	Suche	hauptmenu	view=search	auswandern/noch-fragen/suche	No
860	Forum	kunenamenu	view=home&defaultmenu=862	forum	No
861	Index	kunenamenu	view=category&layout=list	forum/index	No
862	Aktuell	kunenamenu	view=topics&mode=replies	forum/aktuell	No
863	Neues Thema	kunenamenu	view=topic&layout=create	forum/neuesthema	No
864	Ohne Antwort	kunenamenu	view=topics&mode=noreplies	forum/ohneantwort	No
865	Meine Themen	kunenamenu	view=topics&layout=user&mode=default	forum/meinethemen	No
866	Profil	kunenamenu	view=user	forum/profil	No
867	Hilfe	kunenamenu	view=misc	forum/hilfe	No
868	Suche	kunenamenu	view=search	forum/suche	No
869	Forum	anfangsmenu	Itemid=860	kunena-2015-01-28	No

Joomla default template details : protostar | author: Kyle Ledbetter | version: 1.0 | creationdate: 4/30/2012

Kunena default template details : Crypsis | author: Kunena Team |
version: 5.1.0 | creationdate: 2018-05-13

Kunena template params:

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{"DefaultCategoryicon":"iconfolder","profileIconset":"default","DefaultIconset":"default","editorIconset":"default","lightboxColor ":"white","bootstrap":"0","borderless":"0","SubjectLengthMessage":"80","fullactions":"1","quick":"0 ","displayMenu":"1","displayModule":"1","displayBreadcrumb":"1","displayAnnouncement":"0","dis playFooter":"0","avatarPosition":"left","avatarType":"none","labels":"0","whoisonlineName":"defaul t","formRecover":"0","topicicontype":"0","fontawesome":"0","socialshare":"0","socialtheme":"classi c","writeaccess":"0","video":"0","maps":"0","emoticons":"1","twitter":"0","ebay":"0","link":"1","pict ure":"1","hide":"0","spoiler":"1","table":"0","code":"1","quote":"1","divider":"1","instagram":"0","so undcloud":"0","confidential":"0","hr":"0","listitem":"1","supscript":"1","subscript":"1","numericlist": "1","bulletedlist":"1","alignright":"0","alignleft":"0","center":"0","underline":"1","italic":"1","bold":" 1","strikethrough":"1","colors":"1","size":"1","IconColor":"#030303","IconColorNew":"#48a348","av atarSizeX":"40","avatarSizeY":"90","avatarSizeXThumb":"36","avatarSizeYThumb":"36","avatarSizeX Welcome":"72","avatarSizeYWelcome":"72","avatarSizeXList":"36","avatarSizeYList":"36","avatarSize XPost":"144","avatarSizeYPost":"144","avatarSizeXProfile":"200","avatarSizeYProfile":"200","icomoo n":"1","tooltips":"1","displayDropdownMenu":"1","displayDropdownContent":"1","socialsharetag":" ","optional_username":"0","localstorage":"0","editor":"0","wysibb":"","templatebyText":"","templat ebyName":"","templatebyLink":""}

Kunena version detailed: Kunena 5.1.0 | 2018-05-13 [ Ariel ]
| Kunena detailed configuration:

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[t d]crypsis [ tr][td]catimagepath[/td][td]category_images/[/td][/tr] [ td]rtewidth[/td][t d]useredittimegrace[/td][ td]avatarquality [t r][td]userlist_online[/td][td]0[/td][/tr] [td
]showwhoisonline[/t r][ td]trimlongurlsfront[ /tr][ td]defaultpage[ /tr][t d]checkmimetypes[t d]1[/td][ td]720[/td][t d]topic_subscriptions[ td]bcc[ td]file_upload[/td][ td]statslink_allowed[/td][ td]6[/td] [ tr][td]defaultavatarsmall[/td][td]s_nophoto.png[/td] [/ tr][ /tr]

Kunena config settings:
board_offline	0
enablerss	0
thre ads_per_page	20
messages_per_page	10
messages_per _page_search	15
showhistory	1
historylimit	6[/t d]
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template
showannouncement	0
avataroncat	0
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rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	1
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showuserstats	1
show karma	0
useredit	1
useredittime	0
180
editmarkup	1
allowsubscriptio ns	1
subscriptionschecked	0
allowfavorites	0
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allowavatargallery	0
65
avatarsize	2048
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imagewidth	800
imagesize	150
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filesize	120
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rankimages	0
userlist_rows	30
userlist_avatar	0
userlist_posts[/t d]	0
userlist_karma	0
userlist_email	0
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showpopuserstats[ /td]	0
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trimlongurls	1
40
trimlongurlsback	20
autoembed youtube	0
autoembedebay	0
ebaylanguagecode	enus
sessiontimeout	1800
highlightcode	0
r ss_type	topic
rss_timelimit	month
rss_limit	100[ /td]
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_ author_format	name
rss_author_in_title	1
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rss_old_titles	1
rss_cache	900
recent
default_sort	asc
sef	1
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pollnb options	4
pollallowvoteone	1
pollenabled	0
poppollscount	5
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polltime btvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuser slist	0
maxpersotext	50
ordering_system	mesid[ /td]
post_dateformat	datetime
post_dateformat_hover	date time
hide_ip	1
imagetypes	jpg,jpeg,gif,png
1
imagemimetypes	image/jpeg,image/jpg,image/gif ,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
box ghostmessage	0
userdeletetmessage	1
latestcategory_i n	1
topicicons	0
debug	0
catsauto subscribed	0
showbannedreason	0
showthankyou
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	0
bbcode_img_secure	text
list cat_show_moderators	0
lightbox	1
show_list_time
show_session_type	0
show_session_starttime	0[ /td]
userlist_allowed	1
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
first
pubprofile	0
thankyou_max[/ td]	10
email_recipient_count	0
email_recipient_privacy
captcha_post_limit	3
image_upload
moderator
topic_layout	flat
time_to_cre ate_page	0
show_imgfiles_manage_profile	1
hold_new users_posts	0
hold_guest_posts	0
attachment_limit	8
pickup_category	0
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	0
rss_feedburner_ url
autolink	1
access_component	0
1
superadmin_userlist	0
legacy_url s	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_re port	1
searchtime	365
teaser	0
e bay_language	0
allow_change_subject	1
max_links
read_only	0
ratingenabled	0
url_sub ject_topic	0
log_moderation	0
attach_start	0
attach_end	14
attachment_utf8	1
autoemb edsoundcloud	0
emailheader	/media/kunena/email/herowide.png
user_status	1
signature	1
perso nal	1
social	1
plain_email	0
mode rator_permdelete	0
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar	nophoto.png
quickreply	1
av ataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
search_id
avatar_type	1
recaptcha_publickey	6Lc_4dQSAAAAAN5-H1kyFsTNFAeX8-ioP08tlUd2
recaptcha_privatekey	6Lc_4dQSAAAAAJh56_oH2tb0Pi2LN-wxGpvvak6m
recaptcha_theme	clean
keywords	0
user keywords	0
userlist_name	0
usernamechange	0[ /td]
version_check	1
enablepdf	1
jmambot[/t d]	0
annmodid	62
changename	0
user list_username	1
userlist_usertype	0
rules_infb	1
help_infb	1
sefutf8	0
onlineusers	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Enabled
Kunena - AltaUserPoints Disabled
Kunena - Community Builder Enabled: access=1 login=1 activity=0 avatar=0 profile=1 private=0
Kunena - Easyblog Disabled
Kunena - Easyprofile Disabled
Kunena - Easysocial Disabled
Kunena - Gravatar Disabled
Kunena - JomSocial Enabled: access=1 login=1 activity=0 avatar=0 profile=1 private=0 activity_points_limit=0 activity_stream_limit=0
Kunena - Joomla Enabled: access=1 login=1
Kunena - Kunena Enabled: avatar=1 profile=1
Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)
de-DE	German (DE)

Third-party components: None

Third-party SEF components: None

Plugins: None

Modules: None