to all for the debugging help!
As G.B Wolf suggests, it might be that the creation script leaves the file open and thus the program cannot access it later, I'll examine the code if this could be the problem. As Nucklez stated this might be an 0.2.3.0 issue. I am still using the older dll's, so I'll download the latest SVN and see if I can reproduce the error. Is anyone having this problem with an older version than 0.2.3.0?