Focus event randomly stops working

My issue right here is fairly simple. I'm using the mobile SDK 1.1.2. I have a tabgroup, I have windows tied to each tab. I have one tab that pulls some data and then programmatically redirects to a different tab. The tab that is redirected to uses a focus listener on the window. This works fine for a number of sequences, I go to the first tab, do my thing, redirect to second tab, and the focus listener catches the event. Then, suddenly, it'll just not catch it. But then tapping the tab that I was redirected to again seems to fire off two of the events. BUT, then, the application will always crash a little bit after. It crashes with the following message: " *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSRecursiveLock allKeys]: unrecognized selector sent to instance 0x50904f0'"

Does anyone know what this might be from? I'm SO close to finishing my app after overcoming so many bugs that required workarounds, etc, so I'd greatly appreciate help on getting this one ironed out.

Thanks in advance.