Look for a sequence in the Project Window and double click on that.
Also try opening an Auto Save.
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You MAY have a corrupted preferences file
Reset Corrupted Preferences = Press/HOLD Ctrl+Alt+Shift while starting program
Also, will one of your auto-save projects open correctly?
I did attempt your suggestion of double clicking on a sequence in my project window. It opened that sequence in my source window but I still couldn't place it into my timeline. I tried the "Insert" option and it still didn't do anything. I did locate an auto save version from a couple weeks ago and it does work fine. I think that using that version I will have nearly everything I had yesterday except for a couple hours of extra work. That's much better than starting from the beginning. Thanks for your help.