I began mentioning this problem in a thread I posted about nurbs but it doesn't really fit with the subject matter, and at first I thought it was a one time random occurrence. Turns out it isn't.

I'm using Maya PLE, MacBook Pro OS X 10.4.9 1GB RAM.

I will be modeling something. The process will be going along just fine. Then suddenly and randomly (it seems) the model will stop responding to most edits. Standard transforms are legal, but delete faces, creasing (in subds), all of the other essentials have no effect and produce no errors in the console status bar at the bottom. Occassionally transforming will turn off as well: all of these symptoms will apply to vertices, edges, polys in a polygon or a subd, and will only apply to that object, or any duplicates I try to make from the frozen object in an attempt to unfreeze it. I am at a loss, as I can't model things that freeze with no discernable way of unfreezing. I have tried the usuals: save, re-open, restart Maya, restart comp. all to no avail, so it has to be something within Maya that I'm missing... and my guess is it is extremely simple and silly that I'm just unfamiliar with.