Yes, I have had the device up for 5+ hours with multiple reboots,
Issue only occurs on a power off.
EDIT:
So last try,
1. Image Card
2. Boot OPi PC
3. Wait 10 mins
4. Log in
5. Run first run wizard
6. Wait 10 mins
7. Reboot
8. Login, all works wait 10 mins
9. Reboot
10. Login, all works wait 10 mins
11. shutdown -h now
12. Turn on and card is corrupt
I have tried today:
sandisk black, 2GB speed 4
sandisk black, 8GB speed 8
I will buy and try a different brand later on