There was at least one little problem with my config:
all media (pictures, videos, documents, ...) was shown twice.

my assuption was, it's because it's found in
/home/nemo and in /mnt/sdcard2/home

so i renamed /mnt/sdcard2/home to /mnt/sdcard2/.home and adapted the script.

now everything seems to work fine again. will update first post.