Hi Steve, thanks for the advice. I followed both suggestions in the link you posted but niether have worked. I was thinking maybe its hardware related, like not enough RAM? I'm on a MBP with Processor 2.6 GHz Intel Core i7 and Memory 8 GB 1600 MHz DDR3 But that shouldnt be a problem, right?
I have been having this same problem for a few months now, and I'm glad to see I'm not the only person. I'm using a 15" MBP (OS 10.8.3; 2.4 Ghz Intel Core i7; 8GB 1333Mhz DDR3), and occassionally when I use my hot corners every window moves except InDesign. I'm using InDesign in the Application Frame mode. If I have multiple InDesign docs open, the issue can happen with one file being viewed, but then not happen if I switch to a different InDesign file/tab. I've recently noticed that manually changing the order of the tabs starts allowing the hot corners to work again for all documents open.
I have followed the instructions to reset the preferences but it hasn't cleared up the issue.
Anyone else having similar experiences?