After saving the /etc/fstab via partitionmanager (e.g. changing mount point, changing to UUID, ...) all manually entered bind mounts where not carried over and therefore are lost.
Yeah, unfortunately fstab entry code is not very good. Well, at least I think there is a scary dialog box telling you to back up fstab before making changes with KPM. Basically, KPM reads info from fstab that it recognizes and discards everything else. Then it recreates it from the information it knows. Unfortunately, I'm a bit busy with writing up my thesis right now, so I don't have time to fix this... *** This bug has been marked as a duplicate of bug 305469 ***