Blessing and magic weapon question

[Fantomen]

Originally Posted by mockingbird

Specifically I've noticed some odd behavior with the brand type weapons where most of the time (in the course of a single battle) they don't seem to work under under a D9 bless, but sometimes they do.

Any insight would be much appreciated.

Weird. Could it be that they "work" when the D9 effect fails to penetrate the enemies MR?