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Unable to edit work packages

Dear all,

i installed open project on my new server with DEB / REM packages for test purposes.
Everything was working fine so far but it seems that i can’t edit my work packages.
For example:

As soon as i changed the start and end date of my work package the application stopped and didn’t save the changes as you can see in the attachments.
I can still work on my packages but changes will not be saved.
Everythin else is working fine so far.
The problem exists on all web browsers ( chrome, firefox stable & test, IE )

Could that be a bug or is something wrong with my apache webserver?
There are clues in the log file..
Any ideas?

Thank you in advance!

Best regards,

Max