Ok I went back and messed around a little. Restarted my phone, which I do daily anyway, and yes using stock USB. It seems like when I
start in bluetooth and switch to ipod, it
wont play ipod. BUT if I start in ipod it works.
When I tried unplugging the phone (when it wouldn't play ipod), and
started in ipod, it played again. Best guess is a software glitch either with the iphone, or the headunit, but being an FRS, I'm blaming the headunit