Solved Usernames disappeared after upgrading to Kunena 5.1

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Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

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htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload: 32M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
133	Forum	mainmenu	Itemid=123	2012-04-20-12-31-41	No
123	Forum	kunenamenu	view=home&defaultmenu=125	forum	No
124	Index	kunenamenu	view=category&layout=list	forum/index	No
125	Recent Topics	kunenamenu	view=topics&layout=default&mode=replies	forum/recent	No
126	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
127	No Replies	kunenamenu	view=topics&layout=default&mode=noreplies	forum/noreplies	No
128	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
493	Started By Me	kunenamenu	view=topics&layout=user&mode=started	forum/mylatest/started-by-me	No
129	Profile	kunenamenu	view=user	forum/profile	No
130	Rules	kunenamenu	view=misc	forum/rules	No
131	Help	kunenamenu	view=misc	forum/help	No
132	Search	kunenamenu	view=search	forum/search	No
492	Unapproved Posts	kunenamenu	view=topics&layout=posts&mode=unapproved&userid=0	forum/unapproved-posts	No

Joomla default template details : devo3_1 | author: Angie Radtke | version: 2.5.0 | creationdate: 20 Feb 2015

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

Kunena template params:

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{"DefaultCategoryicon":"icon-folder","profileIconset":"default","DefaultIconset":"default","editorIconset":"default","lightboxColor":"white","bootstrap":"0","icomoon":"1","tooltips":"1","borderless":"0","SubjectLengthMessage":"50","fullactions":"0","quick":"0","displayMenu":"1","displayDropdownMenu":"1","displayDropdownContent":"1","displayModule":"1","displayBreadcrumb":"1","displayAnnouncement":"1","displayFooter":"1","avatarPosition":"left","avatarType":"none","labels":"0","whoisonlineName":"default","formRecover":"1","topicicontype":"B2","fontawesome":"0","socialshare":"0","socialtheme":"classic","writeaccess":"0","localstorage":"0","video":"1","maps":"1","emoticons":"1","twitter":"1","ebay":"1","link":"1","picture":"1","hide":"1","spoiler":"1","table":"1","code":"1","quote":"1","divider":"1","instagram":"1","soundcloud":"1","confidential":"1","hr":"1","listitem":"1","supscript":"1","subscript":"1","numericlist":"1","bulletedlist":"1","alignright":"1","alignleft":"1","center":"1","underline":"1","italic":"1","bold":"1","strikethrough":"1","colors":"1","size":"1","IconColor":"inherit","IconColorNew":"#48a348","avatarSizeX":"32","avatarSizeY":"32","avatarSizeXThumb":"32","avatarSizeYThumb":"32","avatarSizeXWelcome":"32","avatarSizeYWelcome":"32","avatarSizeXList":"32","avatarSizeYList":"32","avatarSizeXPost":"32","avatarSizeYPost":"32","avatarSizeXProfile":"32","avatarSizeYProfile":"32","socialsharetag":"","optional_username":"0","editor":"0","wysibb":"","templatebyText":"","templatebyName":"","templatebyLink":""}

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

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Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	20
messages_per_page_search	20
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	crypsis
showannouncement	1
avataroncat	0
catimagepath	category_images/
showchildcaticon	1
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	0
useredit	1
useredittime	0
useredittimegrace	0
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
pubwrite	0
floodprotection	30
mailmod	0
mailadmin	0
captcha	1
mailfull	1
allowavatarupload	0
allowavatargallery	0
avatarquality	65
avatarsize	16
imageheight	4096
imagewidth	4096
imagesize	2048
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2,ini
filesize	2048
showranking	0
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	0
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory
showstats	0
showwhoisonline	1
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	0
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit	100
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
rss_author_in_title	1
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	5
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	mesid
post_dateformat	datetime
post_dateformat_hover	ago
hide_ip	1
imagetypes	jpg,jpeg,gif,png,bmp
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png,image/bmp,image/x-ms-bmp
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	2
latestcategory_in	1
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	1
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	text
listcat_show_moderators	0
lightbox	1
show_list_time	720
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	0
thankyou_max	10
email_recipient_count	20
email_recipient_privacy	bcc
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	flat
time_to_create_page	1
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	1
attachment_limit	10
pickup_category	1
article_display	intro
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	1
rss_feedburner_url
autolink	1
access_component	1
statslink_allowed	1
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	0
searchtime	all
teaser	0
ebay_language	0
allow_change_subject	1
max_links	10
read_only	0
ratingenabled	0
url_subject_topic	1
log_moderation	0
attach_start	0
attach_end	14
attachment_utf8	1
autoembedsoundcloud	0
emailheader	/media/kunena/email/hero-wide.png
user_status	1
signature	1
personal	1
social	1
plain_email	0
moderator_permdelete	0
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar	nophoto.png
defaultavatarsmall	s_nophoto.png
quickreply	1
avataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
search_id
avatar_type	0
recaptcha_publickey	6Lc3yNQSAAAAAEF5hkZiFp8q9XzAV-pEYbOuOIII
recaptcha_privatekey	6Lc3yNQSAAAAAJj44d7AdvlKJ7NYa4G0u5cQn2zB
recaptcha_theme	white
keywords	0
userkeywords	0
userlist_name	0
usernamechange	0
version_check	1
userlist_usertype	0
sefutf8	0
changename	0
enablepdf	1
jmambot	0
annmodid	62
userlist_username	1
rules_infb	1
help_infb	1
onlineusers	1

| Kunena integration settings:

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

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)

Third-party components: UddeIM 4.0

Third-party SEF components: None

Plugins: None

Modules: None