@Matt_H
I used IBrowse the first time and got the corrupted file. Then I downloaded again using OWB 3.22 and that file was fine. I used AmiDVD to burn the ISO to a CD-R disc.
The booting issue seems to be isolated to MicroA1-C so far. Disabling the rear USB ports allows us to boot cleanly with the CD or hard drive. However, some of us experienced the nightmare first before the temporary fix was discovered. For whatever reason, the sytem becomes very unstable if all the USB ports are enabled. We did not have this problem with the previous version of OS4.1.
We don't know if the issue is related to a particular CPU or the MicroA1-C in general. My CPU is an IBM PowerPC 750 GX.
( I personally have experienced a similar unstable system before. Shortly after I installed the original version of OS4.1, I unwittingly used the UBOOT Prefs program included with OS4.1 to change some settings to change the hard drive from PIO to U-DMA 5 mode. My system became extremely unstable and would not boot properly from the hard drive. It took me 2 days to solve the issue. I had to reset UBOOT to factory defaults and disable the USB ports and carefully rebuild my UBOOT settings. Eventually I was able to restore my USB ports. I ran my system in PIO mode for months after that. )
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redfox