Jeff. It works OK in the ProPack. I don't have P4 installed by itself. But it crashes P5 badly. The mouse disappears and only Ctrl+Alt+Del gets you out. I was making my own Geometry swapping .pp2 and I forgot to add the last bit of special code in the channels section that goes like this: geomChan propGeom { uniqueInterp name prop type initValue 1 hidden 0 forceLimits 4 min 0 max 6 trackingScale 0.02 keys { static 0 k 0 1 } interpStyleLocked 1 The prop loaded fine and did not crash P5 until I added that block of code. Of course. The Geomswitching won't work without that block of code. But that's what I've seen so far. ScottA