Under your MIDI mixer you have probably assigned all outputs to 1,2. Change these to 3,4 etc.
A funny related topic that I had last night..no not that one!!
I loaded up a gsp and I noticed that I only had one channel under DSP settings - 1,2
Phunny I fought. I couldn\'t get more. Then I unticked the reset ticks that were set on and just reset the mixer and I got back my 32 DSP mixer channels. My default gsp was set up with just 2 channels.
Wow I fought. 16 stereo channels to put effects on, but what to put where? Reverb on a few certainly chewed up the CPU %. OK I fought again, why not use the AUX busses. If I set 3 busses up with delays, chorus and reverb and control them with MIDI controllers this should work. So I set it up and every time I go into right-click on the wet effects and select the option to show me the controller assignments - it crashes.