I just spent 3 days tracking this little gem down.. loads of fun.
Don't you love when you submit a bug with Adobe they don't let you see your own bug if they consider it a security issue?.. Well here is the report for those who want/need a workaround.
Steps to reproduce:
1.create a typical netconnection with a netstream connected to an FMS server (we saw this bug using edgecast cdn)
2.play a video flv file with audio and right when the file is played or just before, ns.play(name), call ns.receiveVideo(false)
3.This will cause erratic crashes when using IE8 (32 bit) on Windows 7 64 bit
Browser crashes completely
Only the audio portion of the flv would be played.. with no crash of course.
Workaround (if any):
Delaying the call to ns.receiveVideo seems to allow it to continue without crashes