My students mostly work with IE6 within Moodle 1.6.3.
On January 22th my students were not able to work with their Ewiki-environments anymore. When they edit, the text they enter is mostly not saved. When they want to edit again the following message appears: "Sorry, while you edited this page someone else did already save a changed version. Please go back to the previous screen and copy your changes to your computers clipboard to insert it again after you reload the edit screen."
Only when I clear the IE6-cache it is possible for one time. The second time the errormessage appears once again.
The problem showed up exactly at the same time my provider has upgraded PHP from version 4.? to PHP 5.2.0. Before this upgrade there were never problems like this with the students EWiki's. The problems do not occur within Firefox or within Opera.
So the combination IE6 and PHP 5.2.0 gives the problem.
You can find this problem at our schoolsite: wznet.nl. Goto "Brugklas 2007-2008". This is an open course for new students. Choose within this course the wiki "Digitaal schrift-Grafieken".