Aye, It's not an inability to go into instances I'm complaining about. It's how some story driven cut scenes happen outside of the instances.
Basically, if you're in an instance, you get to see the cutscene with the character who's story you're following. If you're in a general area, like where the Jedi Council door meets, you don't get to see that cut scene, because they're not really entering an instance, they're just being fed a cut scene as they stand in front of the door, and the rest of the party ends up waiting around shuffling their feet.
I realize the games PVE is more geared for single player experiences, but it's still annoying..
Also, it looks like the last patch broke your ability to bring outside classes into a character specific instance. I and a friend, each taking one of the Jedi classes, are no longer able to bring each other into those areas, no matter if I try bringing him into mine, nor vice versa.. And yes, the option for "bring in same class" is checked, although I don't believe that applies if you're two different classes of jedi..