I just tried to post a contacty on my logbook,just to get a message saying that my update was not alowed,whats with that?
I think for someone to assist you, more info is needed.
You say "update" but I think you meant adding a new contact into the logbook with another ham, correct? Or were you trying to update one you or someone else had logged already?
What was the exact error you received back and what button were you pressing when you received the error?
The above will be a start...