Well, I tried to uninstall the theme again, and it still leaves my menu inaccessible. Acutally, it's accessible, but you can't see it on the screen. If you hit the start softkey twice, you are in the menu, but the homescreen image stays on the screen. Remembering where the icons are, I can navigate to settings, for example, but I have to do it blind.
I'm no expert on how this device operates, but my guess is that when the theme changed the background image on the menu screens, it didn't restore them when it was uninstalled.
That is the only problem left over. After uninstalling, Media Player is back to normal and the original name of the device is restored in Activesync. Any advice on getting my menu back? Is there a registry setting or something that I can change that will point it back to the right menu screen?
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Ended up doing a hard reset to get things back to normal. Proceed with caution.