This was suppose to have been a new install over top of 11.4 and as I said in previous thread it just upgraded instead.
I have had nothing but problems with crashes, lock-ups and pages just closing without warning, so I cleaned and tested a different H/D and installed fresh but didn't get very far before an error stopped me dead. After 5 attempts with even worsening results, it had to be hardware related (so I thought), but this is the same machine I have used successfully for 11.0,11.2 and 11.4 with no changes made. (and it did accept the 12.1 upgrade previously)
After swapping out everything I could, I still came up short. It also kept me from installing older ver. as well. It would go as far as the partition format and that was it, until I reset the Cmos on the board and tried it again and this time NO problems. ??
Don't know what it was that screwed up the settings, But so far it seems to be fine.