I've got more stat weirdness going on. I just noticed that in my game, the Combat Armor has no Damage Threshold against Plasma attacks. The Damage Resistance is what it's supposed to be, but the threshold isn't. I have no idea what's causing these things. I already reinstalled the patch once, which fixed my earlier problem with .44 ammo. Now, I did a fresh install of the game. Picked Uninstall from the Fallout2 folder (it said it wasn't gonna delete saved games or configuration files) and then reinstalled from the cd, a humongous installation, then installed the original 1.02 patch and then killap's patch. I loaded my savegame and the problem remains. So what exact steps must I take to restore all item/critter stats to their correct state? My Fallout2 folder is the very default one at 'program files/black isle/fallout2'.
EDIT: What I tried next is, I uninstalled the game again, then manually wiped out the whole Black Isle directory which contained the game. I backed up the savegame I needed. Then I reinstalled the game, then the official patch, then the unofficial patch. The problem remains. Many, if not all, types of armor have a reduced or non-existent threshold to plasma and explosive damage. Metal Armor mkII has a DT of 0 for both, for instance. I'm at a loss as to how this can be. I thought the files that determine the item stats were not in the savegame folder but in the game's data/proto folder. But judging from this, the corrupt files must be in the savegame slot folder itself. However, the editor I downloaded, Fallout2 Items Mode Editor, created in April the 2nd, 1999 according to the timestamp on the executable, does not find any editable proto files in the save game folder.