VST plugin -> no sound in Ableton or Cubase SX3

Got a strange problem: Compiled a plugin (effect) and everything is ok in FLStudio 7 or VSTHost, but in Cubase SX 3 or Ableton, I get no sound. When compiling on Mac OS X as AudioUnit I get sound.

Compiled with VSTSDK 2.4

What could it be? Has anyone experienced this problem, too ?

Found out what’s the problem:

It’s because the Input Channel & Output Channel pointers were the same. Since it was non-accumulating outputs, I first cleared them before doing the processing and this destroyed my inputs simultaneously :stuck_out_tongue: