I've already removed them and logs :-\ Some unsupported NIF options by OpenMW.
Those mods are awesome, but some options are not compatible with OpenMW (in it's current state).
Most problems are listed on OAAB_Data page: texture blending, some scripts etc. Now NIFs :-(
OAAB Grazelands may work almost good with older OAAB Data if you force shaders, but that turns my game into lagfest.
Not an investigation, but my experience:
Removed "OAAB Grazelands" and returned to:
Downgraded OAAB Data to 1.2, Red Vos to 1.2, Tel Mora to 2.2. Ashen Divide works good as i can see.
Deleting a branch is permanent. It CANNOT be undone. Continue?