I've just done a second install, and am still having problems. On the first install, I chose Myth when asked to choose between Myth and VDR.
On the first install, I had a full-screen menu, very different from the one I had under 0704. I had a Climate button, with no menu entries inside it. Here Device #15, Appserver, would not start up. As a result, I could not get MythTV working. At least, I think it is as a result - the reason I'm thinking Myth depends on Appserver is because I found something in the 0704 changelog which said something to that effect.
On the second install, where I chose VDR, I have a menu very similar to 0704. No Climate menu. Video and Audio work, but not TV. Appserver and Myth does not start up, and this time, neither does device number #73 (I can't remember what it is). However, I can watch TV under both Myth and Kaffeine under the KDE desktop. When I try under LMCE, all I get is black screen.
I'll go and post in Mantis, then I'll start looking at logs to see what I can find.