I've spent the past few days installing STEP mods, and have been having fairly consistent problems with CTDs roughly since I began the process. I played a pirated copy of Skyrim shortly after it came out, and loved it a ton. Over this past Christmas I bought it while it was on sale, though after installing it I never actually played. Last week, however, I felt in the mood to give the game another go around, but before I did I wanted to see if there were any good mod compilations primarily for beautifying Skyrim - this is how I happened upon STEP. After duplicating the entire Skyrim folder and then moving back to my SSD, I began the process of installing all of the mods in this guide. Around the time I starting adding mods from Section F (the general texture repacks), I started seeing consistent crashes to desktop. I haven't really done anything too fancy like porting myself to Riverwood and running to Whiterun - rather, I've just been starting new games and playing up until you enter Helgen Keep. The few times I've gotten into the dungeon without crashing everything has seemed to work fine, but typically I CTD at one of three points in the intro sequence after Alduin appears: -The scene where Hadvar rescues the boy from Alduin -The scene immediately afterward where you and Hadvar hide against the wall in an alley -Transitioning to the loading screen before zoning into Helgen Keep After some preliminary searching, I believed this was because I was forcing my Skyrim process to exceed the 3GB "cap" - I was running the full-size Textures from Skyrim/Serious HD, plus I had uGridsToLoad set to 11 (with matching Cell Buffer 144; I tweaked a number of additional .ini settings with help from the Geforce guide). I turned the Grids and Cell Buffer down to 9/100 and then 7/64, and later back to 5/36, and while this has more than solved my memory problems, I'm still crashing to desktop at the above points. Thus, I've spent the day logging with Papyrus to try and figure out what is causing the problem. I installed Dual Sheathe Redux last night, but it was causing a huge amount of bloat in Papyrus, so I turned it off, hoping that was the problem. No such luck. I've tended to see the same two terminal errors, including both in the same log. The first is related to script I believe from the Birds & Flocks mod (Section H): [04/16/2013 - 05:50:52PM] Error: Attempting to stop an invalid sound instance stack: Â Â Â .Sound.StopInstance() - "" Line ? Â Â Â [ (1800BAF8)].FXBirdFleeSCRIPT.OnTriggerEnter() - "FXBirdFleeSCRIPT.psc" Line 33 I'm not entirely sure if that's what's causing a problem - most of what I've read seems to indicate that just because an item appears last on Papyrus doesn't mean it's actually the problem - but the time lines up with when Skyrim crashed. I've turned off the mod, and I don't get that last error anymore, but that doesn't solve my CTD issue. The other error is the one that scares me a little bit, though, because it appears to come from the Skyrim Master file itself: [04/16/2013 - 06:07:35PM] Error: Cannot call HasKeyword() on a None object, aborting function call stack: Â Â Â [WI (00035D64)].wifunctionsscript.RegisterDragonAttack() - "WIFunctionsScript.psc" Line 480 Â Â Â [ (00032DB7)].dragonactorscript.OnLocationChange() - "dragonactorscript.psc" Line 110 [04/16/2013 - 06:07:35PM] warning: Assigning None to a non-object variable named "::temp33" stack: Â Â Â [WI (00035D64)].wifunctionsscript.RegisterDragonAttack() - "WIFunctionsScript.psc" Line 480 Â Â Â [ (00032DB7)].dragonactorscript.OnLocationChange() - "dragonactorscript.psc" Line 110 Those two almost always show up together, and both seem to point to the Skyrim.esm. I hadn't intentionally modified it to begin with, and I replaced it with the Skyrim.esm from the clean install, but that didn't do anything. So for the time being, I'm sort of stuck. While I have a few extra mods beyond those on the STEP installed, none of them are major - mostly character visual enhancements, along with ENBSeries, SkyRealism, and CoT - and none of them directly affect dragons. In fact, unless the Unofficial Skyrim Patch alters them in some way, the only other mod I believe I have installed that impacts them is Bellyache's Better Dragons, which adds meshes and textures but no scripts. Hopefully a different set of eyes can point something out that I'm missing. Should I be looking in the errors thrown by the mod compatibility scans? Could it have something to do with that Property Restore function (I have no idea what that is)? I'm pretty clueless here, and hope that someone can help. =/