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I'm having a very similar issue, having a multi-application project where the tabnavigator is used to call other applications within the project, and occasionally freezes up during navigation, giving no errors. This did not appear to happen when the project was a flex 2 built project, but have noticed it since migrating the project to flex 3.
Do you still have this issue, or have you found the work-round?
Seemed our problem was caused by infinite loops. Each tab has a "show"-function. Some of those were called twice thus causing the problem...
Using the debugger in Flex is the answer...
I am also having the same issue. I was using the "creationComplete" event on the Canvases in an Accordian, but I assume that they are very similar to "show". I chnaged creationComplete to "activate" but that did not help. Then I removed all events and the problem still persists. I am not explicitly involing any functionality but obviouslt Flex is doing things like memory allocation under the covers.
If you have any thoughts or further updates it would be appreciated.