Question getting a 404 error after upgrading

Hi I had a working forum, latest stable version, and now that I have upgraded to 1.6 I get 404 errors all over the place. What could be wrong?

This is what the report says:

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

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

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 128M | Max file upload: 50M

Kunena version detailled: Installed version: 1.6.0-RC1 | Build: 3173 | Version name: Kujadili | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Amrit Nam Forum
board_offline	0
board_ofset	0
offline_message	<h2>The Forum is currently offline for maintenance.</h2> <div>Check back soon!</div>
enablerss	1
enablepdf	1
threads_per_page	20
messages_per_page	6
messages_per_page_search	15
showhistory	1
historylimit	6
shownew	1
jmambot	0
disemoticons	0
template	default
showannouncement	1
avataroncat	0
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	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	0
changename	0
pubwrite	0
floodprotection	0
mailmod	1
mailadmin	1
captcha	1
mailfull	1
allowavatar	1
allowavatarupload	1
allowavatargallery	1
imageprocessor	gd2
avatarquality	65
avatarsize	2048
allowimageupload	0
allowimageregupload	1
imageheight	800
imagewidth	800
imagesize	150
allowfileupload	0
allowfileregupload	1
filetypes	zip,txt,doc,gz,tgz
filesize	120
showranking	1
rankimages	1
avatar_src
fb_profile
pm_component
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	0
userlist_joindate	1
userlist_lastvisitdate	1
userlist_userhits	1
latestcategory
showstats	1
showwhoisonline	1
showgenstats	1
showpopuserstats	1
popusercount	5
showpopsubjectstats	1
popsubjectcount	5
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	1
trimlongurls	1
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
fbsessiontimeout	3600
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	recent
default_sort	asc
alphauserpoints	0
alphauserpointsrules	0
alphauserpointsnumchars	0
sef	1
sefcats	1
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	1
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	joomla
integration_login	joomla
integration_avatar	kunena
integration_profile	kunena
integration_private	none
integration_activity	jomsocial
boxghostmessage	0
userdeletetmessage	0
latestcategory_in	1
topicicons	1
onlineusers	1
debug	0
catsautosubscribed	0
showbannedreason	0
version_check	1
showthankyou	1
showpopthankysoustats	1
popthankscount	5
mod_see_deleted	0

You don't have any problems now at your website. You are using K 1.5.12. Your forum is very new - it has two messages posted into it. Have you checked the sticky messages posted in this "Installation and Upgrade" topic?