Problem with getting older page edited

Hi Guys,
if noticed a Problem on my Blog (www.marmsfestiva.de) when i wanted to edit my already existing pages or write new ones, posts and so on.
So these pages posts where already existing and working perfectly by clicking and watching them on the normal side. But when i get into the admin menu and want to edit them there is just the sidebar at the left shown and the content of the page/post is not been displayed and con not be edited. Well iam really dissapointed because the pages where some static ones so i didnt touch them for a longer periode (Previously the editing was working nicely). I got a picture of the mess here (http://marmsfestiva.de/mess.JPG)

What i tried right now:
– overwriting all wp-files with new version
– checking if the connection to database is broken but seems to be ok (wp-database is able to connect and edit entrys aso)
– crying and praying to god of wordpress blogs (he didnt answer)

So ill try my best here i got wordpress 2.7.1–de_DE

Thank you very much for your help btw i used search for older entrys of this topic but didnt find one.