Emulator shows only a white screen... what gives?

Question

I've tried every combination of Flex, Flash Builder, and AIR I can think of & have at my disposal, but I still have this problem.

OSX Lion

Flash Builder 4.5 (CS5.5 installer)

Flex 4.5.0

AIR 2.7 runtime installed

New Mobile Project (tabbed) with tabs a, b, c.
Accept all of the rest of the defaults from the wizard.
Add a debug configuration targeting Xoom
Debug
Where the emulator normally comes up with my app, all I get is a white screen

See it in action here: http://vimeo.com/28179638 (password: "flex")

Here's a screenshot of the firewall dialog that pops up but is quickly dismissed (not hidden behind any windows, I checked): http://skitch.com/fusiongrokker/fu7d5/screen-recording.mov

I downloaded the Flex 4.5.1 sdk, and my test app (new app from wizard) did the exact same thing.

I upgraded to the AIR 3 beta 2 runtime and sdk, and my test app (new app from wizard) did the exact same thing.

I uninstalled Flash Builder and AIR, reinstalled both, and my test app (new app from wizard) did the exact same thing.

What gives? Where do I go from here?

Adam_Tuttle · Answer

I've since been in touch with some folks from Adobe. They gave me two suggestions:

check ~/mm.cfg for lines starting with "Preload"... and remove them.
Start the application using the Flash Builder profiler, terminate the profiler session, then run the debugger again.

Option #2 didn't do anything for me. Fortunately, option #1 did. I had the following line in that file:

PreloadSWF=/Users/me/Library/Application Support/Firefox/Profiles/8nde0w3t.default/extensions/flashfirebug@o-minds.com/chrome/content/flashfirebug/flashfirebug.swf

After removing it, debugging my application works without issue.

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