If I’m not mistaken this happened for me some time ago with objects using a ProOptimizer modifier. Disabling or collapsing it helped. The problem lies within Max’ internal notification system in some cases, it’s not always something that can be reliably solved on Corona’s side.
A way to identify the object that triggers it is to hide/unhide groups of objects and try to figure out which specific object is responsible.
Oh yeah, the coords type-in window flickers a lot when this thing is displayed and you move the mouse, this means it updates constantly… didn’t even know it exists.
Thanks for the info.