Light on Grass Problem in Oblivion

Yep, I started playing Oblivion again but stumbled into this...



www.youtube.com/watch?v=ScPd5ojhidk&feature=youtu 

As you can see, it turns black in certain points of views...

System:

CPU: i7 3770

Motherboard: Asrock Z77 Extreme 4

RAM: 2x4GB G.Skill Sniper 1600mhz

PSU: Corsair Gaming Series 700watt non-modular

HHD/SSD: Seagate 500GB SATA Mechanical Drive; Plextor M5 Pro 128GB SATA SSD

GPU: Gainward GTX660ti

Patched to 1.2.0.416

Official DLC's installed

Shivering Isles installed

Mods:
Unofficial Oblivion Patch
Unofficial Shivering Isles Patch
Unofficial Official Mods Patch
Darnified UI
Natural Environments
Unique Landscapes
Oscuro's Oblivion Overhaul Mod
Brighter Torches

OBGE shaders
godrays.fx
celshader+edgeAA.fx
ENBColorEffect.fx

I didn't put alot of mods in yet, cos I usually benchmark before adding everything to see if there is a problem, but this one in particular, I can't seem to figure out. I deactivate/activate the above mentioned to no avail... it still does that.

I would like to mention I did use Low Poly Grass and since then removed it from my mods list... would that have caused it?

Should I go for a fresh install instead?

Thanks!