Problem with saving / Editing wiki pages

Hello,

My Wiki stopped saving pages today. I checked trying to edit the pages from other peoples computers, and tried editing from other network providers but with no luck.
What happens is that when i click 'edit' I do the necessary changes and click on save it returns "Page not saved. Please take your content backup and try again."
Also, the comments do stick. very weird.

Please help. I must continue work urgently!