Turns out there is some bug – don’t know yet whether it is confirmed as being a Radeon problem or not – that stops fonts from working properly in Jaunty when trying to use MythTV…in any way. You may get all the boxes with no text. Or, you might get just a black rectangle when you try to load the app.
The first step is to ensure you’ve installed
msttcorefonts. Then (from this link), workaround by using
XLIB_SKIP_ARGB_VISUALS="1" mythfrontend (or any other myth command).
Can’t wait until they fix this!