Thanks! I downloaded the Linux version (ipacutil) and it detected an "ipacve". I tried the default config file, which uses Start 1 as the shift button, and that didn't affect anything -- I still can't get any shifted key. Just to confirm, though, the way shifted keys work is that I hold down the Start 1 button and then move the joystick (or whatever), right?
Also, when the I-PAC boots it blinks 31 times. I've read online that the Shift feature is disabled if any key is being held down. According to the docs, 31 times means the 1B button, which I don't use at all -- there's no wire for that connection. I'm assuming that's the problem with Shift.
Also once after booting the "v" key was sent repeatedly. That key is bound to "1 SW 8", but my I-PAC only goes to SW 6! Do I have an ancient I-PAC that actually precedes the I-PAC VE?
Not sure what to try next! Any advice?