ok...i've managed to work around the bug. i loaded the autosave from when i first entered the jedi training area and worked through the area without going to fight the sisters. they can probably be fought if you don't haveyour party back yet, but i didn't try it so its not for sure.
good luck getting through this. i assure you that the game is worth it.
I've been having this same problem. I've tried saving the game and restarting but it's not helping. I noticed the same thing about my party members not following me once I fought with the sisters.