ADE Locks Up On Import/Open of .ascm Book

I'm running Windows 10 and the latest version of ADE.

I borrowed a book through Overdrive and downloaded the .ascm file for it. When I try to open the file in ADE (either through double-clicking it or drag-dropping it into ADE), it begins to import with the 'Downloading Content...' dialog progress bar filling up. But when it seems like it should complete (progress bar full, 'Cancel' button deactivates), the dialog drops into the background but doesn't actually close. From this point ADE is locked up and I need to have Windows kill ADE.

When I reopen ADE, the book I was trying to import is in ADE, but if I try to open it, ADE locks up again. If I try to copy it over to my Nook, it also locks up.

The 'Welcome' ebook in ADE still opens as expected.

I've tried uninstalling ADE, rebooting, and then re-installing ADE and I get the same behavior. I've also tried re-downloading the .ascm file from Overdrive.

Any advice on how to get ADE to work properly?

Thanks!