Solved After update to Kunena 5.0.0-RC4 guest can not write a post

Database collation check: The collation of your table fields are correct

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

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htaccess: Exists | PHP environment: Max execution time: 150 seconds | Max execution memory: 128M | Max file upload: 128M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
512	Rozpocznij dyskusję	menu-u-uzytkownika	view=topic&layout=create	post	No
969	Forum	ukryte	Itemid=970	kunena-2016-07-09	Yes
970	Forum	mainmenu	view=home&defaultmenu=972	forum	No
973	Nowy temat	mainmenu	view=topic&layout=create	forum/nowy-temat	No
972	Ostatnie tematy	mainmenu	view=topics&mode=replies	forum/ostatnie	No
974	Bez odpowiedzi	mainmenu	view=topics&mode=noreplies	forum/bez-odpowiedzi	No
971	Kategorie	mainmenu	view=category&layout=list	forum/kategorie	No
975	Moje tematy	mainmenu	view=topics&layout=user&mode=default	forum/moje-najnowsze	No
976	Profil	mainmenu	view=user	forum/profil	No
977	Pomoc	mainmenu	view=misc	forum/pomoc	No
978	Szukaj	mainmenu	view=search	forum/szukaj	No

Joomla default template details : purity_III | author: JoomlArt.com | version: 1.1.6 | creationdate: April 2016

Kunena default template details : Crypsisb3 | author: Kunena Team | version: 5.0.0-RC4 | creationdate: 2016-07-08

Kunena version detailed: Kunena 5.0.0-RC4 | 2016-07-08 [ RC4 ]
| Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	0
threads_per_page	20
messages_per_page	8
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
disemoticons	0
template	crypsisb3
showannouncement	0
avataroncat	1
catimagepath	category_images
showchildcaticon	0
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	0
showkarma	1
useredit	1
useredittime	360
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	80
maxsig	300
regonly	0
pubwrite	1
floodprotection	0
mailmod	1
mailadmin	1
captcha	1
mailfull	1
allowavatarupload	1
allowavatargallery	0
avatarquality	75
avatarsize	1048
imageheight	800
imagewidth	800
imagesize	150
filetypes	txt,rtf,pdf,zip,tar.gz,tgz,tar.bz2
filesize	120
showranking	1
rankimages	1
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	0
showstats	0
showwhoisonline	1
showgenstats	0
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	1
trimlongurlsfront	60
trimlongurlsback	40
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	1
rss_type	topic
rss_timelimit	year
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	0
rss_word_count	0
rss_old_titles	1
rss_cache	900
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	0
pollenabled	0
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	0
maxpersotext	80
ordering_system	replyid
post_dateformat	datetime_today
post_dateformat_hover	datetime_today
hide_ip	1
imagetypes	jpg,jpeg,gif,png
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	0
debug	0
catsautosubscribed	0
showbannedreason	1
showthankyou	1
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	2
bbcode_img_secure	text
listcat_show_moderators	0
lightbox	0
show_list_time	8760
show_session_type	0
show_session_starttime	0
userlist_allowed	0
userlist_count_users	0
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	every
pubprofile	1
thankyou_max	10
email_recipient_count	0
email_recipient_privacy	bcc
captcha_post_limit	0
image_upload	everybody
file_upload	registered
topic_layout	flat
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts
hold_guest_posts	0
attachment_limit	8
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	0
statslink_allowed	0
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	2
avatarcrop	0
user_report	0
searchtime	all
teaser	0
ebay_language	212
twitter_consumer_key
twitter_consumer_secret
allow_change_subject	0
max_links	6
read_only	0
ratingenabled	1
url_subject_topic	1
log_moderation	1
attach_start	0
attach_end	14
google_map_api_key
keywords	0
userkeywords	0
userlist_name	1
usernamechange	0
version_check	1

| Kunena integration settings:

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

| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (en-GB)
pl-PL	Polski (PL)

Third-party components: CommunityBuilder 2.0.14 | UddeIM 3.8

Third-party SEF components: None

Plugins: Search - Kunena Search 3.1.2

Modules: Kunena Latest 3.1.2.1