Mostly Forza Horizon 3, randomly rotating Fallout NV, TES4, a variant of the first Stalker and a heavily modded Supcom FA that always crashes out in intense fighting. 32-bit exe can't keep up with what the PC can do, not to mention all the memory leaks from AI giving orders to dead units or other backend shenanigans that remain unseen. I still wish someone can fix the Duke Nukem from BlackOpsAR without shoving a single shred of FAF down my throat, and make Nomads stuff properly kill (and get killed by) other factions' custom stuff... underwater railgun simply cannot hit the hulls of custom boats from another mod...
Who was it who mentioned that FSO modding is so much easier than Bethsoft modding... he's right, that's for sure. (though to be fair, the FSO 'feel' doesn't lend well to crazy mergefests as would the latter two sandboxes, since in FSO, different mods are virtually different worlds and rules, kinda... whereas in a Bethesda game you are stuck with that one single realm, so the chaos of merging 255+ mods ensues.)
Good and bad though... e.g. "YEY REAL LIFE MODERN 21st CENTURY GUN IN FALLOUT!!!!111oneoneone" vs "Errrr... this Cyone looks super out of place in say, BP..."
Either way I'm back to near-stock for those. It's not fun at all spending the entire ****ing day trying to merge just 1 thing and watching for anything else breaking, when one could simply just 'play the game' or do something else altogether (i.e. rest on a non-work day). And that's just NV and TES4, don't get me started on FO4 and TES5...