USPS Print Shipping Labels no longer works

Recently, the USPS changed something in their online Print Shipping Labels area -- and now, it's broken. I've tried two different computers using both FireFox and Internet Explorer, and neither of them have successfully been able to print. The new version requires Adobe Acrobat Reader -- which I have, but I still can't get it to work. I'm reminded of the time they rolled out their fancy new "Point of Sale" systems, which had in large lettering on the front, "P.O.S.". It is indeed a P.O.S.

I suspect that it might be a problem with using Acrobat Speedup, which has the wonderful advantage of making Acrobat load instantaneously instead of in 6-10 seconds.* I'll have to do some testing to see if this is the case.

**UPDATE** Nope -- it doesn't work even when Acrobat 6.01 is installed in its default configuration.

ANNOYING. Please get it working, USPS! It was working fine before with the Java stuff.

**UPDATE** I found the fix! The following makes everything work:

Acrobat 5.x

1. From the Edit menu, select "Preferences..."
2. Click the "Options" section on the left, then Uncheck "Display PDF in
browser"

Acrobat 6.x / 7.x

1. From the Edit menu, select "Preferences..."
2. Click the "Internet" section on the left, then Uncheck "Display PDF in
browser"

...

*As some of you have discovered, Adobe Acrobat's browser integration -- especially with FireFox -- can take down your Windows system. It's appalling, really.

**UPDATE** In order to get USPS shipping labels to work properly in Internet Explorer, I had to add https://sss-web.usps.com as a trusted site in Tools->Internet Options->Security->Trusted Sites.