err - well now it doesn't.
Looked up the form ID http://fallout.wikia.com/wiki/Chinese_Stealth_Armor_(Operation:_Anchorage) and then opened all mods in FO3edit and see the only two mods touching the suit are UFP and FWE. But then it is probably not the suit but the effect that is awry.
Hmmm - well let me try a few things ... I'm not sure how to look up stealth field effect (gosh it isn't like chameleon in oblivion). Under Base Effects I found 00052117 Stealth Field, but nothing overwrites.
need to go in game and test with Stealth Boy then bashed patch versus merged ... etc.
[edit] yeah eating a stealth boy with the suit on it says I already have a stealth field active (not in sneak mod though) then taking the suit off it supposedly gave me another stealth field but again still visible. Testing against enemies that would normally not see me when in stealth field and they could without problem - so it is not working.
[edit 2] even switching from bashed patch to merged patch the same results - no stealth field that is visible with chem or armor and certainly no stealth field effects.
The main updates since the change have been FWE/MMM/FOIP ... so of course that is my first suspect, but I could be wrong.
If no suggestions then tomorrow or soon will start tearing my load order apart ... again. Here is my load order with merged patch even:
Spoiler Active Mod Files:00 fallout3.esm01 anchorage.esm02 thepitt.esm03 brokensteel.esm04 pointlookout.esm05 zeta.esm06 Unofficial Fallout 3 Patch.esm [Version 1.2.0]07 Destruction.esm08 PointLookout-FollowersGetToGo.esm [Version 2.]09 Impervious Power Armour.esm0A craft.esm0B calibr.esm [Version 1.4]0C xcalibr.esm0D Project Beauty.esm0E refurbishes [all].esm0F CubeExperimental (EN).esm10 Zumbs' Overhauled Real Time Security.esm11 FO3 Wanderers Edition - Main File.esm12 Mart's Mutant Mod.esm13 Companion Core.esm14 Companion Share & Recruit.esm15 RobCo Certified v2.esm16 Wasteland Whisperer v2.esm17 Enhanced Weather - Rain and Snow.esm18 Xepha's Dynamic Weather.esm19 StreetLights.esm1A dcinteriors_comboedition.esm1B Unofficial Fallout 3 Patch - Operation Anchorage.esp [Version 1.2.0]1C Unofficial Fallout 3 Patch - The Pitt.esp [Version 1.2.0]1D Unofficial Fallout 3 Patch - Broken Steel.esp [Version 1.2.0]1E Unofficial Fallout 3 Patch - Point Lookout.esp [Version 1.2.0]1F Unofficial Fallout 3 Patch - Mothership Zeta.esp [Version 1.2.0]20 FireLightFix.esp21 DarNifiedUIF3.esp22 StreetLights - Wasteland.esp23 TinCanCRAFTing.esp [Version 2.0]24 CRAFT - EnergyAmmo.esp25 CALIBRxMerchant.esp26 InverseCombatKnife.esp27 More Hotkeys.esp28 Princess Better Prompts v1pt1.esp29 Zombie Sounds V2.esp2A GeneratorSound.esp2B Moshman's Wasteland Ambiance.esp2C GalaxyNewsRadio100[M].esp2D RadioBlues.esp2E WAR_radio.esp2F People_Radio.esp30 InvasionRadio.esp31 KBATRadio.esp32 VTAP25.esp33 GhostRadio.esp34 mutantradio.esp35 LookoutRadio.esp36 RadioTenpenny.esp37 Radio Stutter fix.esp38 RadioHotkey.esp39 RadioHotkey_RadioBluesAddon.esp3A CONELRAD 640-1240.esp3B Existence2.0.esp3C UPP - Pack 1.esp3D UPP - Pack 2.esp3E UPP - Original Perks.esp3F UPP - Experience Perks.esp40 UPP - Quest Perks.esp41 PreWar Book Titles and Perks.esp42 Combat Style Perks.esp43 NotSoFast.esp44 HeirApparent.esp45 BoSPatrols.esp46 MarkB50K_Wasteland_Patrols.esp47 tubRRCompound.esp48 Stealth Kills Enabled.esp49 Stealth Kills Enabled - Pitt Compatibility.esp4A Echo_BatteryCharger.esp4B HouseholdWaterPurifier.esp4C BlackWolf Backpack.esp4D GunnySack.esp [Version 1.3]4E 1Animated Nightvision goggles.esp4F Directional PipLight HDR.esp50 Expanded Megaton House V3.esp51 MaintenanceShed.esp [Version 1.3]52 merc.esp53 moremapmarkers.esp54 maxlevelworkaround-hp-bs.esp55 wastelandmastery.esp56 skillcheck.esp57 Treasure Maps_Underground.esp58 Treasure Maps_Secrets of the Wasteland.esp59 Treasure Maps_Bobblehead Edition.esp5A Treasure Maps_A Fist Full of Caps.esp5B Destruction - Main.esp5C Destruction - Main - Statics.esp5D Destruction - DLC.esp5E Destruction - DLC - Statics.esp5F MTC Wasteland Travellers.esp60 DCInteriors_DLC_Collectables.esp61 Rivet City Realignment.esp62 Greenerworld.esp63 MovinOnUp3.0.esp64 FO3 Wanderers Edition - Main File.esp65 FO3 Wanderers Edition - DLC Anchorage.esp66 FO3 Wanderers Edition - DLC The Pitt.esp67 FO3 Wanderers Edition - DLC Broken Steel.esp68 FO3 Wanderers Edition - DLC Point Lookout.esp69 FO3 Wanderers Edition - DLC Mothership Zeta.esp6A FO3 Wanderers Edition - Alternate Travel.esp6B FO3 Wanderers Edition - Optional Restore Tracers.esp6C FO3 Wanderers Edition - Optional VATS Realtime.esp6D FO3 Wanderers Edition - Project Beauty.esp6E FO3 Wanderers Edition - Project Beauty (Followers Enhanced).esp6F FO3 Quest Patch - FWE + BS.esp70 weaponmodkits.esp71 WeaponModKits - FWE Master Release.esp72 WeaponModKits - OperationAnchorage.esp73 weaponmodkits - thepitt.esp74 weaponmodkits - brokensteel.esp75 WeaponModKits - PointLookout.esp76 weaponmodkits - zeta.esp77 Echo_UseBothGloves.esp78 Tactical Weapons by gRs Frederyck.esp79 xcalibrmunitions.esp7A xcalibrmunitions_fosenhancements.esp7B ZL-ACR.esp7C ZL-SVD-CALIBR.esp7D Dogmeat Leather Armor - CRAFT.esp7E Dragonskin Tactical Outfit.esp7F DragonskinBonusPack.esp80 stealthboy recon armor - craft.esp81 calibr ammo schematics - craft.esp82 CRAFT Improvised Weaponry.esp83 CRAFT Improvised Weaponry - Unmodeled.esp84 eve.esp85 eve operation anchorage.esp86 EVE - FWE Master Release.esp87 EVE - FWE Master Release (Follower Enhanced).esp88 EVE Anchorage - FWE DLC Anchorage.esp89 EVE - FWE with WeaponModKits.esp8A FalloutFood.esp8B FalloutFoods - FWE Master Release.esp8C ZORTS - Custom HP - FWE.esp8D ZORTS - Disable FWE activate.esp8E Companion Core DLC Addon.esp8F Wasteland Whisperer v2 Broken Steel Addon.esp90 RobCo Certified v2 Mechanist's Edition.esp91 RobCo Certified v2 Zeta Addon.esp92 RobCo Certified v2 Omnipatch.esp93 RobCo Certified v2 Version Updater.esp94 Mr Smith's Scrapyard.esp95 Playing With Firepower.esp96 ThePitt-NoFireFollowers.esp97 Phalanx-Obedient-Dogmeat.esp98 DogmeatEssentialModv1.2.esp99 Move-Dogmeat.esp9A DogmeatStealth.esp9B ImmersiveHealth.esp9C Mart's Mutant Mod.esp9D Mart's Mutant Mod - DLC Anchorage.esp9E Mart's Mutant Mod - DLC The Pitt.esp9F Mart's Mutant Mod - DLC Broken Steel.espA0 Mart's Mutant Mod - DLC Point Lookout.espA1 Mart's Mutant Mod - DLC Zeta.espA2 Mart's Mutant Mod - FWE Master Release.espA3 Mart's Mutant Mod - Project Beauty + FWE.espA4 Mysteriouswoman_corsetntrousers.espA5 T3T_MiscItemIcons.espA6 ACRForFWE.espA7 SVDForFWE.espA8 DTOForFWE.espA9 Gifts4Kids.espAA megalight.espAB Enhanced Weather - Rainbows.espAC Enhanced Weather - Weather Sounds in Interiors.espAD Realistic Interior Lighting.espAE Realistic Interior Lighting - BS.espAF Realistic Interior Lighting - OA.espB0 Xepha's Dynamic Weather - Main.espB1 Xepha's Dynamic Weather - Rain.espB2 Xepha's Dynamic Weather - Anchorage.espB3 Xepha's Dynamic Weather - The Pitt.espB4 Xepha's Dynamic Weather - Broken Steel.espB5 Xepha's Dynamic Weather - Point Lookout.espB6 Xepha's Dynamic Weather - Experimental Green Tint Remover.espB7 Xepha's Dynamic Weather - Sandstorm.espB8 Xepha's Dynamic Weather - Sandstorms Damage Armor.espB9 Xepha's Dynamic Weather - NightTime SneakBoost.espBA PiPBoy Light Range x4.espBB PiPBoy Yellow Light.espBC xCALIBR_override_FWE5.espBD FWE(v.5.04)+WMK_weapons_xCALIBRified.espBE frederyck+FWE+xCALIBR.espBF tubunarFWE.espC0 Merged Patch 1.esp