I have discovered a bug where changing the number of displacement subdivision iterations on an Arnold Tag that's attached to some geometry will cause the geometry to render incorrectly in the IPR. For some reason, any value entered into this parameter that is >= 8 (for subdiv Type Catclark) by clicking the increment up and down arrows causes the geometry to change drastically to something incorrect. But typing in the value 8 into the parameter and pressing Enter on the keyboard causes the geometry to display correctly. This problem is the same for subdiv Type Linear at a value of >=7 for some reason. Quite bizarre.
This problem also seems to occur if you enter a higher value such as 8 and quickly toggle the IPR render region ability before the IPR has a chance to start actually rendering the new level of subdivs.
