Performer reverb is fed by a tiny fader in each source channel (horizontal reverb send fader). Then if reverb is active and level is up it should work.
Sorry to hear that Cubase crashed, it is very stable normally. If you like, you can send the crashlog as a PM to me so we can check. Also Cubase does auto-save (to .bak), but you may have to enable it in preferences.
Thanks for your patience.