There is probably some bug in both CWFinder. Also, the same thing happens to me that the existing key in cw_list, CWFinder does not find the key. I think the problem is in CWFinder if some other application is open at the same time. Maybe Notepad++ or some other application or some of tools.
In such cases, i exclude all applications and tools and restart CWFinder.
In such cases, i exclude all applications and tools and restart CWFinder.