I'm using 7342 on Os X and Windows.
I have to comment out all my implementation of 'toString()', and it does actually works better, but it still hung on some evaluation. (particularly when trying to watch hibernate session content).
in the status bar it would display 'evaluating java.lang.String java.langObject.toString() even with Debugger->Enable 'toString()' object view disable, or alternatively enabled but with the radiobox on 'For classes from the list' while keeping the list empty.
I've tried both, it always stops somewhere and nothing seems to happen. No HD reads, no cpu consumption.
I don't remember having those problems with IDEA6.