Audio stopped working for playback of all video file types (LR 4.4)

Been using LR 4.4 on same 64-bit Win 7 PC a long time with no such issues.  No change to environment.  Same files play fine through Windows Media Player and played fine in LR yesterday.  What's up???

Hello, berti,
Welcome to the discussions! It sounds as if you are doing all the correct things.
Problem # 1:
Some of us have had the same experience with IM HD5. The playback begins to jerk and stutter even though there is nothing wrong with the movie. If you can still work with your movie, you will find that the resultant DVD is fine, no stuttering or skipping. I have found that the playhead stops and jumps from one photo or clip to the other. To check that my transitions are ok, I manually move the playhead so I can see the effect. I have learned that the end result will be ok, so I just continue finishing the movie. Yesterday, I had to restart my computer after I quit iMovie (for another reason, not due to iMovie) and when I launched iMovie again, the playback was better. Restarts may not always help, though.
Problem #2:
I have also had problems exporting back to the camcorder. Previous to upgrading to Tiger, my exports went flawlessly. After Tiger, began having difficulty. Things worsened after the upgrade to QuickTime 7.0.3. Also, if iMovie is jerking and skipping, you will have problems with the exporting.
My solution is to save the movie as QuickTime Full Stream. You can easily do this because you have a lot of free space. (You are duplicating your movie, so you need space for it).
After the QuickTime movie has been created, open a new iMovie and name it. Then, import the new QT movie into the new project. Save it, and then try to export that to your camera. That has worked for me every time.
Post back if this does not help.

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