OK, I didn't have a problem doing this in CS4....
Installed configurator 2.0 on my new Win 7 64 bit machine. Built a simple panel, exported it, double checked in extension manager - it's there..
Went to Photoshop CS5 (64bit) and did the "windows, extensions" thing, but the panel doesn't show there.
I have been able to download a panel from the exchange and see it in Photoshop, so I know it works.
Any ideas as to what I'm doing wrong? 
