April 21, 2008 - Wiki is locking up and won't accept edits.

I have about 90 students that are creating a wiki for a class project. The main project is due today (Monday April 21) and all of the students are having a lot of difficulty posting. They all have a lot of experience using pbwiki as they completed a project for me earlier in the semester but currently, the wiki seems to be locking up and not accepting edits. (They know not to edit the same page at the same time.) We currently have 97% of our purchased disk space available so I do not think it is a space issue. Are there problems on your end that might be causing some of the issues I am talking about?

our wiki is called http://wximpact40-88.pbwiki.com/

thanks for your help!

eric snodgrass