Since upgrading to the Ermine beta, I cannot let my EE go into hibernate; it won't wake up and I have to yank the battery to reboot.

I've noticed other people mentioning this problem in the "Ermine Experiences" thread but they are hard to follow. If you've had problems with hibernation after upgrading to Ermine, please post your experience here and anything you've tried (successfully or unsuccessfully) to remedy this problem.