The good news is Gex works perfect in PJ64 b3 (donate and you will receive my child! - so endeth todays sermon) ;-)
On 1.3 I saw the same thing, showing a worrying lack of a social life though I recently spent an evening going through the 100+ games that I have and working out which emulator works best with each one, if anyone is interested I could post it.
If you can't wait (and wont wait) then today you can use N*mu, it works perfect on my system
PIII 1Ghz
256M Ram
Radeon Mobility