Thanks Boris...

I am not trying to open while connected to the PC. I only wish to sync between PC and desktop so any markups are in the latest version.

Previously, I had files loaded into the Library, and then when I moved things around on my desktop, to move into Adobe Digital Editions, I think things got a little confused. For whatever reason, the eDGe wasn't allowing me to "reload" into the Library without first deleting from the Library. I deleted everything from the Libraray, and then reloaded from the SD, and all seems to be back in order now.

I suppose my "problem" was that I saw book titles in two different places and desired to minimize used storage space. Since the eDGe requires files to be in the Library, though, in order to do markups, I wonder whether that is a duplication of storage space that can be avoided.

Whatever the case...all good now. Thanks again.