[android-developers] Non-responsive Activity on Back

I have an account picker Activity modelled after the iosched AccountActivity, but for my app's custom accounts. When I press the "add account" action it launches a connect account Activity for that custom account. If I press back from here (trying on Nexus 7 Android 4.1) I come back to what looks like my AccountActivity screen, but with one important difference - it's just a still, non-responsive screen. I'm using ABS 4.2 if that could affect anything. Somehow if I just press back once more, nothing visually changes (no screen refresh of any sort), but the screen is responsive again. Any ideas what I could look for to resolve this? I added a test button to my layout to see if the whole screen was non-responsive, or if it was just the "add account" action.

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