[Strether]

This is the first time I've tried to install a new update to Calibre and I'm sure the solution is an easy one, but... On installation, it didn't retrieve my library, and when I try to import the library using "Add new books" it won't recognize the folder the library is in, though the folder is there with all its contents. It also won't allow me to drag and drop a new title. So how do I regain the library? Appreciate the help.

Jim