Why are some things just much harder than they need to be? Finding a current, easy-to-use data source for populating a country selection box, for example.
You can find a list of fixed issues in the release notes, including the template cache issue that I was running into.
Bad decision. This needs to change.
Enabling accessibility features for The GAE SWF Project resulted in an 8KB file size increase in the SWF file. I can live with that. Creating inaccessible SWF files to save a couple of KB is no savings at all.
The Flex accessibility overview page feels woefully outdated and mention Adobe Flash Player 7. We're on 9 now. Let's update these, guys!
Note that your document class in Flash projects should extend org.gaeswf.flash.BaseApplication and your Application MXML in Flex should be of type org.gaeswf.flex.BaseApplication (if none of this makes any sense to you, see my Flex 3 Code Behind Quick Start.)
Update: As of 2.30pm (when I last checked), the app appears to be working again. I've made no changes whatsoever.