Something else I noticed, which may or may not have something to do with it, is related to the UI. The UI started up and ran fairly well, but I got multiple copies of this message as it was starting:
warning: unknown model code in hostID, assuming sun4_260
My 'hostid' command prints '5200804d' if this helps...
In the current release (1.1) the ui uses the hostDB (defined in hosts.self) to look for certain default information, such as the framebuffer to run on.
These warning messages can be ignored; they just indicate that the hostDB is incomplete, not having entries for your kind of machine. In this case, I believe that the first two bytes, 0x52, indicate a Sparcstation IPC, which we hadn't put into the hostDB.
You can eliminate the warning message if you wish by adding entries for the IPC into the hostDB. The file hosts.self is pretty long, but you can probably figure out what to add (after a while) by patterning after other entries.