QBI v3.21 has been posted to the contribution section (as usual, it will take a few hours to be available).

It fixes 3 bugs found in 3.20. If you have already applied the fixes in the previous posts, then you do not need to upgrade from 3.20 to 3.21.

1. Fixed output error upgrading from 3.0x or 3.1x if configuration wasn’t re-saved
2. PHP error message on Match|Shipping page fixed
3. Payments weren’t working

Thanks,
Adam