Hello,
Did you check all sections in the event viewer in computer management console? I mean - check if Application, Security and System does not contain some strange entries.
System usually logs any problems with applications that could not be launched in some way - either by showing a message box or by logging information to event log. Unless there are any traces of problems with launching ch, then most probably I can't be of any help here. I must note here that I have tested ch on Win7 x64 rc and it does work properly.
If you are unsure - please post a screenshots from event log after you tried to run ch64.
Regards,
Ixen
P.S. There is one more thing you could try. Locate the directory where CH profile directory is located (probably something like c:\users\xxx\local settings\Copy Handler) and check if the log file contains any information. From version svn224 it should log information about launching and closing application, so we might know something from there.