And we have... failure! Woo hoo!
I have the same behavior as before the beta firmware. I just now tried to print something, about 22 hours after flashing the router to the new firmware, and the new shareport client is stuck in it's never ending attempts to connect to the printer. I can't reboot the router right now, since I am VPN'd into work, but I am confident that if I reboot the router, the printing will start.
This is with A1/A2 hardware and an HP 1510 PSC printer. With firmware 1.21, this setup worked, all the time.