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All of sudden lately when exporting a video from iMovie '11 the format does not seem to be acceptable to YouTube, both audo and video. Is Mountain Lion causing iMovie'11 to not export media properly? We have exported video using these following options:

A. Share > Export Movie...

Option A exports as normal, but just as soon as the upload to YouTube begins we receive the following error messages from YouTube on audio/video during this process.

B. Share > Export using QuickTime...

Option B seems to take up an awful lot of space and even seems to be stuck after encoding around 1/3 of the video. Here's more info:

Share > Export using QuickTime...

Options >

These are all of the same settings we have always used. Any advice that would help us resolve this matter would be greatly appreciated.

Warm Regards,

-JCpro