I think I know what's happening.
Please download this setup
ftp://ftp2.coollector.com/coollect/Coollector_Setup.exe
and install it (no need to uninstall before).
The problem should be gone.
Explanation: version 2.68 had introduced the bug you describe, which affects only very big coollections. I've quickly fixed this bug, but you must have downloaded the buggy version during the few hours it was available.