I have the same GPU as you.  Others have experienced the same delay.  I'm not sure anyone has figured out the cause.

Yes, this has been greatly improved in PS 22.  The editor opens almost instantaneously on my machine, although it opens fairly quickly in PS21.  Are you sure you have the latest patch installed?

What are you using to make the capture?  A firewire port or a capture device?  What happens if you start a new capture at the point on the tape where the audio drops out? And welcome to the forum.  

Is it from a protected DVD or Blu-ray disc?  (The title certainly suggests that it is.) Added:  And further investigation indicates that mv4 files are DRM-protected files from the iTunes store.  So, it is highly unlikely that PS 21 will be able to import it.

You are not the only one complaining about this.  Hopefully, some changes will be made in a future patch.

As always, Dennis, welcome back. 

Seems to be working OK here.  Try taking a new title and doing a Save As.  Are you still getting a crash?

Color key-framing is possible in the HSL mode, not the basic.

I can reproduce the issue you have raised.  It has been reported.

Bob was asking about the availability of a boxed/backup disc version.  I think that's covered by the thread title.   And you should throw a noodle against a wall and see if it sticks.