Boxes around shadows and particle effect crashing my game

I haven’t changed any hardware or software recently, but despite that boxes appearing where shadows should be, especially when there are magical projectiles. It’s difficult to get a screenshot because it happens so fast. This is causing my game to crash. Is there anything I can do to fix this?

I am playing a paladin with Fortitude equipped and I have heard this can cause problems because of Chilling Armor.

Playing on Win10 on a PC that easily passes the recommended specs.

well two questions:
1.does your CPU have an integrated GPU?
2. if #1 is true, than which GPU is the game using?

It might be that your integrated GPU got a driver update via windows update, and it automatically enabled it as feasable to run D2R, instead of the dedicated GPU, windows if not told specifically “not to” will use integrated gpu to run D2R, and despite what minimum requirements say, D2R will run on moderately recent intel iGPU with Dx12 enabled driver and those beeing the ones past dec 2022…

there is a nessecity to tell windows to use dedcated GPU for D2R in order to benefit from it… an in case of Nvidia that had a certain setting for that in the past, it’s no longer relevant, as it got obsolete and surpassed by a windows 10 and 11 setting…