[alleymize]

I have been using Calibre with no issues until this morning. I add an epub book, as I always have, and right-click on the title for the window and click on convert individually. Normally a new window would appear with the conversion options, now Calibre just hangs. The top menu bar turns gray like it is trying to do something but nothing ever happens as long as I wait. I look at task manager and see a calibre worker process open but nothing ever happens. Please help and thanks for your time.

Sorry forgot to mention I am on windows 10 64bit and using version 4.5.0