I noticed that moving mixer faders (level or pan) using the mouse button or mouse wheel generates some pops and cracks. This can be easily perceived using Synth1 with a simple sine wave and tweaking these controls.
When I automate these faders I don’t have this problem.
Maybe this could be some conflict with my graphic or sound card? Anyway I tried in another host and I don’t have this problem. In podium don’t have this problem tweaking knobs in plugins guis either.