I did what you said and under CPU it was all zeros except 99 under idle. I clicked on the Master Movie Folder and it opened immediately. Now it works fine. The only thing I can think is that I cleaned the registry and deleted temp files. Then I defragged the disk. I thought those were good things to do to keep the computer running efficiently.
Now that the files are already showing in the Pop Up window when I click on browse, it works great. That is how it had worked before.
For future reference, do you think what I did to "clean things up" was the problem. It sounds like it to me, but I am no expert.