I think it's due to residual settings from the old reflection and deformation plug in. I've attempted a complete reset of the settings and still no go though. The cube caps stay black and glitch out when I spin it etc and I see multiple copies of each window. It's like it's trying to display the "inside the cube" setting and the regular just floating 3d window at the same time. Here's one example (rep isn't high enough yet for fancy img imbed, sorry)

http://i.stack.imgur.com/rrbBd.jpg

Any ideas? I'm trying this on my desktop which is using an NVIDIA 8800 GTS card. I also tried it on an older laptop that uses an intel card and same deal. I think maybe I can use the dconftool and try to see if there are still settings from the deformation and reflection plug in causing this. Unless someone knows how to get that back (either a beta or an old version) somehow?