YouTube Player problems is caused by Flash Player bugs.
We can't load multi YouTube Players in AS3 content and also we can't unload a YouTube Player from AS3 content. These problems are definitely caused by Flash Player bugs. Strictly AVM1Movie has some bugs.
I logged some bugs.
Please vote for these if you care about this problem.
AVM1Movie fails to load internal SWF sometimes.
MovieClipLoader.unload method doesn't work correctly in AVM1Movie which is loaded by AS3 Loader.
The relative position of SWFLoader which loaded AVM1Movie doesn't work correctly.
I logged some bugs.
Please vote for these if you care about this problem.
AVM1Movie fails to load internal SWF sometimes.
MovieClipLoader.unload method doesn't work correctly in AVM1Movie which is loaded by AS3 Loader.
The relative position of SWFLoader which loaded AVM1Movie doesn't work correctly.
YouTube doesn't seem to have a cross-domain.xml. What can I do?