Apparently there is some issue with new version 9.50.
If no audio on input, meter on clipper shows huge activity.
Edit: it's happening on Dutch Chocolate Moose preset
Ok, I did some digging and it's apparently caused by Stokkemask. If you lower "Use area" to 98% it's gone. This has been there for a while, probably since the last Stokkemask improvement.
My guess is that this isn't audible but I'll have to run some tests to make sure. It does indicate that _something_ isn't working exactly as it should. But it also only seems to affect near-silence (the effect is the biggest at about -80 dB).
Lowering Use area to 98% definitely has no measurable effects on Stokkemask precision, so you can safely do that if you don't trust it.