weird wild stuff...ok not wild, but weird

[05uurx]

Okay, this is a drawing that i drew back in the Fall of 07' the customer's bank account took a dive and the plan was haulted before draft #1 was completed since the customer had no money...anyway...now they have money.

everything was fine with the model back then...but now when i open the house and open my existing elevation camera, i get what looks like the ceiling showing through the roof. I tried deleting the camera and re-creating it, but its more of the same.

BUT, when i zoom in close to the house, the ceiling line dissapears!

Is it my video card? I doubt it, i have the same card now as i did in the fall...all the hardware is the same.

anybody have any ideas? i cant get rid of the ceiling line.