It seems that usually, when i enter into "vehicle mode" such as mounting a turret or grabbing onto the Wyrm for the Sons of Hodir quest, I can NOT cast any of the spells given to me.

I currently do NOT use any bar addons (such as bartender). Current addons include Xperl, DHUD, Quartz, Omen, recount and Quest Helper.

There are no interface error messages when I mount or when I try to cast so I am not sure to what the problem is. Is therea solution other than /reloadui (which also does not work).