In terms of mods I have the MSGO and as for dialogue mods I have NO lore and the LGNPC mods. I couldn't think of anything else affecting dialogue so badly.
Anyone have any idea what's causing it? Would be greatly appreciated.
Post your Load Order.
And have you tried Mlox http://code.google.com/p/mlox/wiki/Mlox
The fault is with LGNPC NoLore version 1.00. There were a couple improperly-filtered greetings intended for vampire players. These were fixed in the version 1.01 release available http://lgnpc.org/downloads. I apologize for your inconvenience.