I've been installing a fair few mods with no problem, however recently I've come across several NPC raiders who are bright pink..
I understand that if you have Boone as a companion, then NPCs will become pink to be more visible, however I haven't left DC, let alone recruited Boone.
There also seems to be an issue, when the raiders die, the "mesh missing" exclamation point appears. This slowly appears, rather than appearing immediately. When other NPCs are killed, there is no problem (I've killed mole rats, even the NPCs in Megaton and there's no issue).
I have attached images to point out what I mean, and also included my mod list.
[list]
[*]FalloutNV.esm=1
[*]DeadMoney.esm=1
[*]HonestHearts.esm=1
[*]OldWorldBlues.esm=1
[*]LonesomeRoad.esm=1
[*]GunRunnersArsenal.esm=1
[*]CaravanPack.esm=1
[*]ClassicPack.esm=1
[*]TribalPack.esm=1
[*]MercenaryPack.esm=1
[*]Fallout3.esm=1
[*]Anchorage.esm=1
[*]ThePitt.esm=1
[*]BrokenSteel.esm=1
[*]PointLookout.esm=1
[*]Zeta.esm=1
[*]TaleOfTwoWastelands.esm=1
[*]Project Nevada - Core.esm=1
[*]Project Nevada - Cyberware.esp=1
[*]Project Nevada - Equipment.esm=1
[*]Project Nevada - Rebalance.esp=1
[*]Project Nevada - Extra Options.esm=1
[*]FCOMaster.esm=1
[*]Mart's Mutant Mod.esm=1
[*]More Perks for Old World Blues.esm=1
[*]More Perks for Honest Hearts.esm=1
[*]More Perks for Dead Money.esm=1
[*]More Perks for Companions.esm=1
[*]More Perks.esm=1
[*]More Traits.esm=1
[*]IWS-Core.esm=1
[*]STRobot-Core.esm=1
[*]AWorldOfPainFO3_TTW_2.2a.esm=1
[*]WMVM.esm=1
[*]CFWNV.esm=1
[*]TTW_StashPackOptions.esp=1
[*]TTW_CompanionWheelFixesForReal.esp=1
[*]ttw24afollowerfirehirefix.esp=1
[*]TTW_OutcastTrading.esp=1
[*]TTW_MoreCookingItems.esp=1
[*]TTW_Bobbleheads.esp=1
[*]TTW_AnchorageCustomization.esp=1
[*]Project Nevada - Cyberware Additions.esp=1
[*]Project Nevada - Rebalance Complete.esp=1
[*]Project Nevada - All DLC.esp=1
[*]FCO.esp=1
[*]FCO - OnHolyServiceBound NPC's.esp=1
[*]TTW_SuperMutantRebalance.esp=1
[*]Mart's Mutant Mod.esp=1
[*]More Perks for Old World Blues Update.esp=1
[*]More Perks for Honest Hearts Update.esp=1
[*]More Perks for Dead Money Update.esp=1
[*]More Perks for Companions Update.esp=1
[*]More Perks Update.esp=1
[*]Mart's Mutant Mod - Increased Spawns.esp=0
[*]Mart's Mutant Mod - Increased Increased Spawns.esp=0
[*]PerkEveryLevel.esp=1
[*]Mart's Mutant Mod - Zones Respawn.esp=1
[*]SignatureWeapons.esp=1
[*]SignatureArmor.esp=1
[*]NewVegasBounties.esp=1
[*]NewVegasBountiesII.esp=1
[*]More Traits Update.esp=1
[*]IWS-Core-Guards.esp=1
[*]IWS-Core-Patrols.esp=1
[*]IWS-Core-Civilians.esp=1
[*]IWS-DM.esp=1
[*]IWS-HH.esp=1
[*]IWS-OWB.esp=1
[*]IWS-LR.esp=1
[*]Improved Sound FX - Weapon Sharing Fix.esp=1
[*]Improved Sound FX.esp=1
[*]Expanded Traits.esp=1
[*]CONELRAD 640-1240.esp=1
[*]STRobot-Companion.esp=1
[*]STRobot-ChemImmunity.esp=1
[*]TTWAWOP4DC.esp=1
[*]A Trail of Crumbs.esp=1
[*]WeaponModsExpanded.esp=1
[*]wmx-ttw-unified.esp=1
[*]TTW_NoKarmaDCFollowers.esp=1
[*]Busworld.esp=1
[*]ttw_-_add_4_eyes_to_power_helmets_-_overrride.esp=1
[*]ttw_-_custom_race_ending_fix.esp=1
[*]TTWHOMESWEETHOME.esp=1
[*]Follower Amata ULTIMATE.esp=1
[*]CFW-DLC.esp=1
[*]ttwspeechchecks_1.esp=1
[/list]