Question utf8_to_unicode: Illegal sequence identifier in UTF-8 at byte 0 in ...unicode.php on line 110

I have updated 1.5.11 version to the new BETA on a local copy of a site. It is a Russian-speaking site. Instead of some messages or the text I see error message:





I will try to insert such combination of characters here at a forum.

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

Legacy mode: Disabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled | htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload: 20M

Kunena version detailled: Installed version: 1.6.0-BETA1 | Build: 3068 | Version name: | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Клан Архангелы игры Perfect World PvP Online - pwpvp.ru
board_offline	0
offline_message	<h2>Форум закрыт на техническое обслуживание.</h2> <div>Мы будем рады видеть вас позднее!</div>
enablerss	1
enablepdf	0
threads_per_page	30
messages_per_page	25
messages_per_page_search	25
showhistory	1
historylimit	10
shownew	1
jmambot	0
disemoticons	0
template	200907_the_deep_inside_dark last
showannouncement	0
avataroncat	1
catimagepath	category_images/
showchildcaticon	1
annmodid	62
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	1
showkarma	1
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	0
subscriptionschecked	0
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
changename	0
pubwrite	0
floodprotection	20
mailmod	0
mailadmin	0
captcha	0
mailfull	0
allowavatar	1
allowavatarupload	1
allowavatargallery	0
imageprocessor	gd2
avatarquality	95
avatarsize	150
allowimageupload	0
allowimageregupload	0
imageheight	1024
imagewidth	768
imagesize	300
allowfileupload	0
allowfileregupload	0
filetypes	zip,txt,doc,gz,tgz
filesize	120
showranking	1
rankimages	1
avatar_src	fb
fb_profile	aup
pm_component	uddeim
userlist_rows	30
userlist_online	1
userlist_avatar	1
userlist_name	1
userlist_username	1
userlist_posts	1
userlist_karma	1
userlist_email	0
userlist_usertype	1
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory	0
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	10
showpopsubjectstats	1
popsubjectcount	10
usernamechange	0
rules_infb	1
rules_cid	1
rules_link	www.kunena.com/
help_infb	1
help_cid	1
help_link	www.kunena.com/
showspoilertag	1
showvideotag	1
showebaytag	0
trimlongurls	0
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	0
ebaylanguagecode	en-us
fbsessiontimeout	1800
highlightcode	0
rss_type	thread
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_word_count	0
rss_old_titles	1
fbdefaultpage	categories
default_sort	asc
alphauserpoints	1
alphauserpointsrules	0
alphauserpointsnumchars	5
sef	0
sefcats	0
sefutf8	0
showimgforguest	1
showfileforguest	1
pollnboptions	4
pollallowvoteone	1
pollenabled	1
poppollscount	5
showpoppollstats	1
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	1
maxpersotext	50
ordering_system	old_ord
post_dateformat	ago
post_dateformat_hover	datetime
hide_ip	0
js_actstr_integration	0
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
integration_access	auto
integration_login	auto
integration_avatar	kunena
integration_profile	kunena
integration_private	uddeim
integration_activity	alphauserpoints
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
onlineusers	1
debug	0
catsautosubscribed	0
showbannedreason	1
version_check	1
showthankyou	1
showpopthankysoustats	1
popthankscount	5
mod_see_deleted	0

[А]рхи
If I insert a similar combination of characters at this forum - all text in a post is not displayed.

[ë]ë
If I insert a similar combination of characters at this forum - all text in a post is not displayed.

its seems Joomla bug
post your Joomla ,PHP ,MySQL version

Joomla! version: Joomla! 1.5.20 Stable [ senu takaa ] 18-July-2010 Platform: Apache/2.2.4 (Win32) mod_ssl/2.2.4 OpenSSL/0.9.8d PHP/5.2.12 (localhost) PHP version: 5.2.12 | safe_mode: Off | register_globals: Off | mbstring: Not installed | GD: bundled (2.0.34 compatible) | MySQL version: 5.0.45-community-nt

I think, such combination of characters is a rarity. But on my site - it a logo ;(

try to install mbstring