So my friend recently attended the Kentucky regional. And was 2-1 going into the final round with two 3point victories. He had been calling me between the matches to give me updates on how he was doing and I wished him luck as he ventured into the final round, a win and he would be in the top 4 and play for a Gencon Badge, a loss and he was heading home. An hour went by and I got the sad news that he was, in fact, defeated. He was telling me of this key moment when he ran Cad Bane deep into enemy territory and swapped in Arica to Blaster Barrage an R7, Arica, Ozzel, and Palleon. Now Palleon as you know has Ysalamiri, and they were all within 6 squares. My friend declared he was going to Blaster Barrage and named all of the targets ( the 4 that I meantioned) and the guy he was playing said he couldn't because Ysalamiri gave them all force immunity. Now I see how this could work.... Because you have to target the characters with Blaster Barrage, but at the same time I thought Lightsaber Assault worked against force immuned characters? It was a critical point b/c he had a chance to do 40 damage to Ozzel, and Palleon, kill the R7, and a possible 60 to Arica (he had Moff Nyna Calixte in his group) And of course he wins the next initiative round, which would have given him the chance to kill Ozzel, Palleon and Arica, which would've changed the outcome of the game completely. Now my friend didn't call a judge over, which is totally his fault, but it has just been bothering me as to whether or not it works? So the question is.... Can you Blaster Barrage someone with Force Immunity?

As Sithborg said, if you are within 6 of a character with Ysalimiri, you can't spend Force Points, but to answer your question:

Here is a list that I made up a long time ago that clearly states which force powers can and can't be used against characters with force immunity. This list is updated through Masters of the Force.

Yes-(force power boosts attacker's stats and abilities)
Aing-Tii Flow Walking
Battle Meditation
Blaster Barrage
Control Minds
Dark Temptation
Dispassionate Killer
Force Leap
Force Valor
Force Weapon
Indiscriminate Rage
Knight Speed
Lightsaber Assault
Lightsaber Precision
Lightsaber Sweep
Lightsaber Throw
Master Speed
Overwhelming Force
Sith Rage
Use the Force
Whirlwind Attack

No-(Deal damage directly or apply some other effect, or avoid damage)
reroll saves or attacks
Absorb Energy
Dark Force Spirit 1
Drain Life
Force Absorb
Force Alter
Force Blast
Force Bubble
Force Burst
Force Defense
Force Grip
Force Heal
Force Lightning
Force Push
Force Repulse
Force Sense
Force/Light Spirit
Force Storm
Force Strike
Force Stun
Force Thrust
Force Whirlwind
Illusion
Jedi Mind Trick
Levitation
Lightsaber Block
Lightsaber Defense
Lightsaber Deflect
Lightsaber Reflect
Lightsaber Riposte
Pawn of the Dark Side
Sever Force
Shockwave
Sith Grip
Sith Hatred
Sith Hunger
Sith Lightning
Sith Sorcery
Transfer Essence
Unleash the Force

Shatterpoint and Force Corruption can be both, depending on the timing. You can't target a character with Force Immunity, but if they are targeted and THEN become Force Immune, they will still be affected.