Based on
https://www.mobileread.com/forums/showthread.php?t=55945, drag & drop and syncing are working for 50,0%. For 11,9% it's sometimes working.
But for 40,5% it's not working at all. (Multiple choice, not exactly adding up to 100,0%.)
I'm one of the latter (at least for internal memory, which is the only option for Sony 300).
I've tried all the tips: Checking Java version, deinstalling and manually deleting the hidden files, checking for corrupt files, ....-
The only thing I haven't tried is installation on Mac or under Windows XP instead of Windows Vista or installing on a "new" system without any 3rd party applications.
I'd like to check, whether the ones of you being able to use eBook library 3.0 have something in common, be it OS, applications in the background, ...
So, please only answer if eBook library 3.0 (at least partially/sometimes) is working for you. Only 3.0, please.
Update:
For me , it's working now:
https://www.mobileread.com/forums/sho...81&postcount=1