I have fixed the problem. Can you download Beta15b again (http://www.genopro.com/beta/InstallGenoProBeta.exe) and confirm the fix?
Yes, I changed the way the metafile is stored in the clipboard. Originally I was suspecting a memory leak during a copy & paste operation. I changed the code and tested the new code on all my computers (95, 98, NT 4.0, 2000, XP, 2003 and Vista) with applications such as Word, Excel and Paint to discover it worked fine. (I don't have PowerPoint by the way).
The documentation for the API SetClipboardData() is very sparse and does not explain the transfer of data ownership for the CF_ENHMETAFILE parameter. This is nothing new but the norm with Microsoft documentation. You have to find it out by yourself - or by a customer reporting a problem.
SetClipboardData()
CF_ENHMETAFILE