Just reporting problem and possible solution...
I faced the same problem, and hasn't found any answers here or elsewhere...
My FLA has only one scene, btw...
I'm working on a mac, and sometimes the FLA would open and sometimes Flash crashed. Even if you're able to open it and do a "Save as...", the problem persists...
I opened the file on a pc and the same occurred...
The solution I found was selecting all the layers in the root timeline, do a "Copy Frames", create a new document, do the "Paste Frames", save the file , and "voilá", the problem disappears...
And now, within this new FLA I found one missing PNG... maybe this was the fault, a corrupted bitmap...
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