Poked around for a while and I can find people mentioning that bug but no fixes to it for console players, which is both curious and silly. I'll keep looking, I know what a nuisance that sorta thing can be. Not really a GOOD solution but whenever I have trouble with companions and stuff not pathing or moving properly, I use Unrelenting Force and it works sometimes. ._.;
Also, I have the strategy guide, too, and while it says the Master magic level quests are offered at 90, they're really offered at 100. Go figure.