Roomworks crashes Cubase 5.5.3

When I activate Roomworks with a number of EastWest Play instrument tracks loaded, a message appears – “Cubase has stopped working”, and I have to reboot the computer.

I deactivated all reverb instances in Play to make sure there was no conflict. Roomworks seems fine with Kontakt libraries, but seem to cause trouble with Play libraries when several instrument tracks are loaded at the same time.

I have 5-6 gigs of samples loaded (I have a total of 16 gigs available), so I am not even near the RAM limit.

I would appreciate any help with this. Thanks.

Is your Windows and Cubase 64-bit?