somehow I did open 4 windows of the library. I can close these library windows one by one but when I chose to show my library again all 4 windows open. I tried to reset it with chosing my standard workspace but it still happens allways when I open my library window again again.
I have also encountered this problem before. I had 3 Library panels!
Jen from Adobe pointed me to this thread:
I had to save my workspace twice before I could get rid of the 2 extra panels.
Hope this helps.
Wow, Adobe knows this bug since June but don't care to fix it. That's what I call a good support. :-(