I have version 4.2.12 MPVI 1 Pro and an LS 408 large cam engine build. The only work around I have at this point it to alter the MISFIRES table as stated on the HP Tuning School's site. The path I know to take is Engine Diagnostics and then the tabs for Misfires, DTCs should appear. I do not have the MISFIRES tab. Can someone share if they can see this MISFIRES table and if I'm missing something then please share as well.
I did contact support via email and have a trouble ticket currently in the system.
Thanks,
Jim