Uncommon "Other space" problem? HELP!

ok, i'm going to try to keep this short, but i'm terribly frustrated right now. in the efforts to track down and rid myself of the nasty 4.3 battery drain bug, i decided to do a "restore to factory" of my iphone and then rebuild from backup.

when i did so, my phone ran out of space when it previously had 4-5 gb free space (32gb model). i've combed this site and the web to find solutions. most suggest that its some "orphaned files" that got lost in a partial sync. but my problem seems different that one others have noted previously.

anyway, i thought i could solve it by removing the music and rebuilding the playlist again (having also wiped out the music directory structure using a tool like DiskAid), but that's just as bad:

- as i add album by album new music, i see the space usage go up on the "other" category as much as it does for "audio/music." what the?

i haven't seen any comment about this in particular, let alone a solution! anyone else encountered this? any fix?

is this a problem with 4.3? 10.2.1 itunes? (i'm starting to have issues with my ipod touch too which was syncing last night to get a couple of apps and it ran out of space too -- it too is running 4.3

help! any suggestions?

 

thanks, tried that and no success. tried many other things as i noted including starting from scratch. this is so bizarre! i can only think it may be the new itunes and not my devices themselves or 4.3 since it's common to more than one device?