The VP 150 is supposed to be video shielded for placement near a TV correct?

I have this speaker which I purchased several years ago (2002), and I just moved it to my living room system. It can not be placed on top of my tube TV or within about 6 inches of the top of the TV without causing quite a bit of video distortion.

I'd like to be able to set it directly on the TV. Is there something wrong with my speaker? Does the shielding degrade over time, or could it have been jostled out of position in some way? Anyone know how I can fix this?

Thanks,
Bryan