I have been running an old (July 2006) version on my IPOD video 30G for some time.
I just tried to upgrade to the latest version. I'm pretty sure that I followed the instructions correctly---unzipping the archive directly into the root of the IPOD file system. I verified with "ls -l" and "diff -r" that plausible changes were in fact made. I tried the latest and three different daily builds. I also tried moving or copying .rockbox/rockbox.ipod down to the root level (since I observed that it had been there before).
In all cases that I tried, the rockbox loader appeared to work, and produced the message "Rockbox loaded." But no more activity. I watched the loader display for a few minutes, with no response to normal Rockbox button commands, including holding the lower circle down for shutdown. I was able to shutdown with the select+menu, and to reach the IPOD native system and the disk mode.
I restored a saved version from April 2006 (like a doofus, forgot to save the later one), and it works fine.
I verified that I was getting the 30G version and not the 60/80G.
Any hints greatly appreciated.
Mike O'Donnell
http://people.cs.uchicago.edu/~odonnell/