like i said, i've tried it a couple of different ways, and there are 2 separate issues:
1. needing a restart to add to/create a playlist after the initial add.
2. not adding all files from a given directory/genre/artist/etc

#1 does seem like a bug.
#2--are you saying that this is a "feature" of the program, to prevent slowdowns? is there a workaround? i'm able to add the files that were missed afterwards, but i have too many to try that with all of them, so i'm not sure if this is a bug (ie, the program is hanging on one unidentified file name/format or something) or intentional.