I'm on the pc, and I just got to tranquility lane. Now when I sit in the lounger, the white screen pops up, then it goes away and I'm sitting there still in the lounger, unable to get out. I think it might be a mod doing this, not sure why else it would be. Anyone one know what could be causing this?

Load order please. It will help in tracking down the problem. Just copy to clipboard and paste it here.

Unofficial Fallout 3 Patch.esm
FallsChurchMetroFix.esm
Fallout3.esm
DCInteriors_ComboEdition.esm
Mart's Mutant Mod.esm
CALIBR.esm
FOOK2 - Main.esm
FOOK2 - [[censored]] World And Neighbourhood Kit.esm
StreetLights.esm
dD-Reduced Dismember Force.esp
dD-Less Blood Time, Larger Blood.esp
dD-More Gore.esp
Phalanx-OPTIONAL-WeaponRepairLists.esp
Heights.esp
Phalanx-PerksAndStims.esp
Phalanx-MainFollowerModule.esp
999 Weight Limit.esp
pater_NoTrace.esp
Onehitter's Creature Health Balance Add-On.esp
Onehitter's Increased Durability Add-On.esp
Onehitter's Combat Realism.esp
RRR 1.0.esp
CASM.esp
bltc.esp
BLTC Immersion Patch.esp
BLTC No Overdosing.esp
BLTC Less Addictions.esp
Mart's Mutant Mod - FOOK2.esp
dD-Reduced Ragdoll Force.esp
WeaponModKits.esp
Mart's Mutant Mod.esp
Mart's Mutant Mod - Hunting & Looting.esp
Mart's Mutant Mod - Natural Selection.esp
Mart's Mutant Mod - Tougher Traders.esp
Mart's Mutant Mod - Zones Respawn.esp
Mart's Mutant Mod - Master Menu Module.esp
FOOK2 - Main.esp
megalight.esp
FOOK2 - [EVE] Energy Visuals Enhanced.esp
ReneerInvisibleKarmaMod.esp
FreePlayAfterMQ_V05.esp
RealPhysicsWithCarExplosions.esp
UPP - Pack 1.esp
UPP - Original Perks.esp
UPP - Beverage Perks.esp
UPP - Quest Perks.esp
UPP - Experience Perks.esp
Burnification.esp
CapsDoubled.esp
UPP - Pack 2.esp
Hi-Res Weapons & Ammo Textures.esp
Stealth Kills Enabled.esp
SniperZooming.esp
Sprint Mod.esp
Arwen_VisionFX.esp
Dragonskin Tactical Outfit.esp
Road Warior Armor.esp
DarNifiedUIF3.esp
Owned!.esp

Total active plugins: 59
Total plugins: 120

It's been a while since Ive used FOOK but this used to be a problem which I think has been resolved.
You should think about updating to a newer version of FOOK, which I think also incorporates Phalanx into it so you probably won't need to keep that in your load order.

^This. The NVG activator's script in v1.0 froze right there, but it's been fixed for quite some time along with gobs of other stuff.

You'll want to grab http://www.yourfook.com/downloads/, then your load order should look something like...

Fallout3.esm
Unofficial Fallout 3 Patch.esm
FallsChurchMetroFix.esm
DCInteriors_ComboEdition.esm
CALIBR.esm
FOOK2 - Main.esm
Mart's Mutant Mod.esm
FOOK2 - [[censored]] World And Neighbourhood Kit.esm
StreetLights.esm
DarNifiedUIF3.esp
dD-Reduced Dismember Force.esp
dD-Less Blood Time, Larger Blood.esp
dD-More Gore.esp
Phalanx-MainFollowerModule.esp
Phalanx-OPTIONAL-WeaponRepairLists.esp
Heights.esp
Phalanx-PerksAndStims.esp
999 Weight Limit.esp
pater_NoTrace.esp
Onehitter's Creature Health Balance Add-On.esp
Onehitter's Increased Durability Add-On.esp
Onehitter's Combat Realism.esp
RRR 1.0.esp
CASM.esp
bltc.esp
BLTC Immersion Patch.esp
BLTC No Overdosing.esp
BLTC Less Addictions.esp
dD-Reduced Ragdoll Force.esp
WeaponModKits.esp
megalight.esp
FOOK2 - [EVE] Energy Visuals Enhanced.esp
ReneerInvisibleKarmaMod.esp
FreePlayAfterMQ_V05.esp
RealPhysicsWithCarExplosions.esp
UPP - Pack 1.esp
UPP - Original Perks.esp
UPP - Beverage Perks.esp
UPP - Quest Perks.esp
UPP - Experience Perks.esp
Burnification.esp
CapsDoubled.esp
UPP - Pack 2.esp
Hi-Res Weapons & Ammo Textures.esp
Stealth Kills Enabled.esp
SniperZooming.esp
Sprint Mod.esp
Arwen_VisionFX.esp
Dragonskin Tactical Outfit.esp
Road Warior Armor.esp
Owned!.esp
Mart's Mutant Mod.esp
Mart's Mutant Mod - Hunting & Looting.esp
Mart's Mutant Mod - Natural Selection.esp
Mart's Mutant Mod - Tougher Traders.esp
Mart's Mutant Mod - Zones Respawn.esp
Mart's Mutant Mod - Master Menu Module.esp
FOOK2 - Main.esp
http://www.yourfook.com/forum/showthread.php?t=4307
Mart's Mutant Mod - FOOK2.esp

This happens to me everytime I use a custom race, I'd reccomend changing to a valina race first, then change back after leaving the simulation, using the facegen excanger to fix your face when you go back!