I had a weird problem with this plugin last night. I was using it on a synth bass part and even though I could hear the compression working, the GR meter didn't budge at all, even if I cranked the input and compression knobs all the way up. Same plugin on a different track and the needle was bouncing around normally.
Also, I haven't read the manual yet. Does anyone know what its official attack/release characteristics are? They seem pretty fast from looking at the GR meter (when it works).