I'm having exactly the same problems. We have a couple of
sites configured with Contribute, no problems until a couple of
weeks ago. Our systems administrator is looking into it as it seems
to be something to do with user permissions on the server. I'll let
you know if/when I hear anything back.
I dont know which version you are using but I was using v.3.
Here's what I did:
Downloaded the 30 day free trial of v.4
set up the connection (during which a similar error was found
- something to do with administrative rights - except v.4 was able
to overcome it)
re-Install v.3 again