Vanishing access panels?

I have a medium sized cruiser, about 30k or so, with 6 docked batteries. There is an access panel on each battery that lifts up 1 meter and then slides forward about 4-6 meters to allow access to the wireless modules and other logic. The problem I am having is that these sliding access panels are all......gone. Let me cover a few points, as I'm sure they'll be asked:

(1) This happens on multiplayer and single player.
(2) This happens when hand building, admin loading, or shipyard loading...

Vanishing access panels?