OK, so I used the 1.7 util disk to blast with 1.7 firmware (was at 1.6) and it now says, HW version 2.2, Firmware ver 1.7.
Got my d2prog the other day and flashed the chip to 2.3. I am having the same issue with not accepting the disk sometimes.
Same problem here. Wii doesn't accept disks every once in a while. Turn it off and back on and it is fine. D2pro with 2.5 and 1.7. It's a little annoying, but not the end of the world.
i also have this problem
wii fw 4.0
d2pro fw 2.7