Digital Editions keeps crashing

Been using it for a while now without issues. Could easily copy my downloaded library ebooks to the ereader.

Today I wanted to do that again, and all of a sudden, it keeps crashing. When trying to copy the book to the ereader, the copy screen goes into an endless loop and DE stops responding. When I ultimately end the process and restart DE, it wont even find my library and I have to do a complete reboot for it to show my books.

Nothing changed as far as updates go, since the last time I used it. Already tried reinstalling, but that didnt work.

Anyone have a clue as to why it has this annoying behavior all of a sudden and perhaps have a fix?