I tried out HF5 RC1 for a couple of days, and I ran into some bugs, especially involving startup, shutdown, and sleep modes.
When I would put the Pandora into sleep mode via the switch, the system and LEDs would power down normally, but the screen would stay backlit. It also would not come out of this, and had to have the battery dropped to fix it.
Any time I tried to restart the Pandora or shut it down, I would get a screen that was bottom half the "Zaxxon" loader and the top half had a blinking cursor, and then nothing. Had to drop the battery to stop this.
Also, quickly inserting SD cards would make the Pandora not recognize them; I found if I pushed the stick in and held it for a second or so, watching for the read/write light, then it would work great.
I've flashed it back to HF4, but if these seem like concerns someone might want to look at I'm more than willing to reflash and attempt to duplicate them... as long as someone gives me instructions on how to properly log it and all that.
But other than that, keep up the excellent work. I honestly cannot put the Pandora down.
Also, some suggestions for later updates:
Put a "Sleep Mode" option in the GUI, and/or enable the Pandora button to wake the Pandora when pressed (with, of course, the lock button preventing this)?
If it can't do it already, work some magic so the bluetooth will connect to a hands-free ear piece or headphones?
Ability to swap the functions of the gamepad buttons and the right nub for mousing controls (buttons click, stick does pgup/pgdn/end/home)?