(Um... looks like the list server ate my previous attempt to send this... so if 
you're getting this twice, sorry!)

OK, I think I've isolated the issue... basically, __weak, @public, and 
-fno-objc-arc don't like to play nice together. If you set a @public __weak 
instance variable (may also apply to stack variables, I haven't tested that 
yet) in a file compiled with -fno-objc-arc, and then access it in a file 
compiled with ARC turned on, the variable gets zeroed out.

I have reduced it to a simple test project, and I'm going to file a RADAR.
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