Thanks. I am bemused by why it fails for me on two PCs but not for you. Wonder if anyone else has seen this problem?
Could it be that you're using a brand new OS and that it might have some bugs?
It sounds like you're wanting to execute the Copy command as quickly as possible and aren't changing any settings before you start the copy, correct? If so, then Jerry's suggestion will save you even more time since holding down the Shift key while issuing the Copy command will skip the dialog and just use the last settings, saving the time of initializing the dialog. The copy operation will begin immediately. Many other parts of Photo Mechanic offer the same short-cutting of the UI and allows the particular operation to commence immediately.
I'm sorry we couldn't reproduce this problem, but we're not going to hold the final 4.6.2 release for this issue alone. I hope you understand.
-Kirk