This has done it to us twice.  Two people playing.  Upon getting all the canisters, true jedi and the orange brick, once the four forcefield units are shut down and the switches pulled, the two arrows above the field are dim red and the forcefield is still up.  Nothing tried worked (blowing things up, going over the rooms again, exiting and coming back in, turning off all the extras).   So the level can't be finished.

Is it something about two people playing?  Or that one is gold and one silver?  How about extras being on at all in the level?  Getting TJ and brick and canisters all at once?  

Anyone else have the forcefield fail to open?  And since the game won't save the progress, all that can be done is to exit to the cantina.    I call BS!    Very frustrating.

I did this with one person and although the other character vanished (they showed up when I went back outside....) I did get through it.  Twice.  I only gathered the True Jedi the first time, but I don't think that's it.  And it doesn't seem to be the order you do the 4 switches in, although it can't hurt to do the one in the control room last.

But it appears that if two people are playing and they don't use the switches at the same time, the forcefield will not lower.  So word to the wise; in coop, do the switches at the same time, or have one person drop and let the computer do the other one.