IE v Firefox

So, I have a quirks mode web app using GWT 2.1.2. It runs just fine
under Firefox, Sea Monkey (Mozilla derivative), and even Safari (on my
iPhone). On IE, however, it pops up the password dialog box, accepts
a user id and password, then gives a completely blank screen. On
errors on the server side.

How do I go about debugging this sort of problem?

TIA,

Greg

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