Did you edit header.html or footer.html?
Looking at source code of your site html is for some reason "mixed" or "broken" (some unclosed tags maybe?)
Try to edit that summary and press <> in editor to clean all tags and save.
EDIT: At least
<table id="layout-table" summary="layout">
is not closed at all
I didn't edit this files.
(table id="layout-table" summary="layout")
is not closed at all
In which place I have to modify this code ?
Regards, Arek
I think you have the same problem as http://moodle.org/mod/forum/discuss.php?d=89083
"Something" in front page topic section is probably breaking page html and you have several ways to edit it...
Or maybe the Solar-System-famous Edit-Mode-Makes-Things-Vanish problem:
http://docs.moodle.org/en/Administration_FAQ#Incomplete_page_displayed_when_I_click_.22Turn_Editing_On.22
http://moodle.org/mod/forum/discuss.php?d=69176#p383162
http://moodle.org/mod/forum/discuss.php?d=69176#p344981 (mine, on not removing a module properly)
RLE
Yes, it's possible too...although then problems usually appear when you press "Turn editing on". Now html is broken all the time.
If you can't find anything wrong from topic section my next guess is that you should change some code in theme Chameleon css (file user_styles.css). Urs has the following text in file Readme:
You must not write hooks as comma separated lists of elements like
td#middle-column div.bt, div#middle-column div.bt { ... }
in Chameleon themes because the Chameleon engine can't handle these comma lists. Please write two seperate statements instead.
td#middle-column div.bt { ... } div#middle-column div.bt { ... }
Your theme user_styles.css has some such tags so I suggest to test if this problem exists in Standard theme and if it does not Chameleon css should be checked next...
Setting debugging to all from administation menu or checking server logs might give more info if none of the previous help.
Now, I couldn't tell you exactly what I did to break it (other than obviously some bad HTML!), but to fix it I went to mdl_blocks and got the block id for the HTML block, then went to mdl_block_instance and searched for that blockid and pageid=1. I took the most recent record and copied the data from configdata over to notepad and then cleared it out and saved it. This cleared out everything I'd put in the HTML block and I was able to work with it again.
I didn't spend a whole lot of time trying to figure it out, but this seemed to be the best answer at the time.
Thanks,
Matt