More information would likely be helpful in figuring out what the problem is, however I often find Calibre freezes for me as well. It doesn't mean the program isn't working correctly. It just means that it's doing some on your computer sometimes takes time to work, especially if you have a large collection. I find if I'm patient and wait that it always finishes what it's doing and starts working just fine again, even though Windows initially reports that it's not responding. This is especially true when you have a large library as I do (3,000+ books).
Eric
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