It has been identified that when selecting Blend + Paint on guide numbers 1758, 1757, 1756 and 1755 brings up an error message stating 'Not Allowed With AZT Painting !'.
This has been confirmed as an error and will be fixed in a future data release.
As a work around please enter any Blend + Paint opeation for these guide numbers into Zone 99.
Resolved December 2017, in data release version 4.48.