Lost messages
If the message window winds up with some error message, you can often get back to your work by simply right-clicking on the window and hitting "back." Don't know if this works on all browsers. On IE, the HZ posting window writes the message to the clipboard as it tried to post, which also gives you a backup.
So far, IE7 works pretty good for me, although I've had to dink around with some of the enhanced security functions. I'm fiddling with the popup blocker for one.