Vishimtarr's Shadow bug?

Does anyone else find that seems to randomly remove movement buffs when it fades? Personally I've had it happen with eagles (not good) and with infusion, neither of which use slot-4 for movement.
EverQuest Shamans, Paladins, Druids, etc.
http://www.shamanscrucible.com/forum/
http://www.shamanscrucible.com/forum/viewtopic.php?f=26&t=4604