[Brian]

Sorry for the trouble this is causing! We've identified a couple of places where DropDAV sends back malformed responses to WebDAV requests. We don't handle those invalid responses as gracefully as we should, which is what causes the login process to stall. Both parties have some bugs to fix, in other words.

My guess is the iWork for iPad team encountered a problem like this before and have workarounds in place; we need to add something similar to our own code.