Black screen upon entering Great Barrows

this is the second time this has occured.. first time i thought it was an issue with my graphic update that i recently downloaded, so i uninstalled my drivers and reinstalled them and it seemed to have worked but i was out of great barrows at this point.. i just went back in and i could see my screen then i moved a bit afterwards and received a black screen with the mouse visible and the game still running, i could still cast spells and whatnot but the screen was black

it stays black until the group leaves and i`m back in the towns or wherever.. the other skirms work it just seems to occur in great barrow and i don`t know why.. it`s very frustrating and i don`t know what to do.. i`m running

an amd radeon 7700 hd series and i`m using the high res version of lotro if that means anything... any help is appreciated thank you