http://skyrim.nexusmods.com/mods/41592//?

Posting with permission on behalf of the mod author.

Description:

AFAIK, it involves fixing bugs in skyrim's memory pipeline that caused a stack overflow to happen with higher uGrids settings.

Obviously, while this might stabilize uGrids to not crash the game all the time, you'll likely run into a lot of performance issues if you really crank it up since it loads those cells in.