You can get it to work by first browsing local themes, then switch to online. Fast click on a random theme and wait for the previews to load. Then when you return to the list with themes, they're all there and stay there
The port I did last week for the cdma desire had the theme issue. But this weeks port is working fine for the most part. On wifi the themes are working and showing but if you aren't touching the screen it blacks out. 3g they are fine. But no fc's.
It was built from the gsm desire source if that helps you guys any. As the only difference really is the kernel in the rom.