There are bugs left - that's for sure, but some could be fixed:
---------------------------------------------------------------

Did not make use of AFTER_DIR
(fixed by Ingo Brueckl, ib@wupperonline.de)

Notes saved on exit with wrong position and size
(fixed by Ingo Brueckl, ib@wupperonline.de)

Hidden notes : try to hide / save all notes / Exit
Then reopen : it's not working !!!
(fixed by Ingo Brueckl, ib@wupperonline.de)

Hidden notes is not working : display even unhidden notes !
(fixed by Ingo Brueckl, ib@wupperonline.de)

Raise/Lower sometimes not working
(fixed by Ingo Brueckl, ib@wupperonline.de)

Worst of all : right click root note win can lose focus & never gain it again
(fixed by Ingo Brueckl, ib@wupperonline.de)