Thanks a lot for your answers!
In my case, it is not the software that freezes but the Ebook-reader itself (after being disconnected and while loading). Then, only a hard reset can revive my PRS 650. The software, both the “Reader library” and the “Reader for PC”, seems to work fine.
The texts I read are articles for academic purposes. They are in pdf format and were made searchable by Abbyy Finereader, so there is definitely no DRM involved. Anyhow, I tried the drag-and-drop-idea. Unfortunately, no change at all.
As I see it, there are only two possible solutions to my problem. To go back and to reinstate the affairs as they once were (with “Reader Library”). Or to go forth and to go on working with “Reader for PC”. But then I would have to change its annoying way of truncating my highlights (not to speak of my comments).
Another software might do the trick. Do you mean “cool reader”? In that case, I doubt that it could cope with PDFs (
https://www.mobileread.com/forums/sho...d.php?t=174917)
wonderose