Wozarg previously brought up a similar situation in the Questions and Feedback forum here: http://www.cardhunter.com/forum/threads/dice-roll-under-1.647/ I was running the Dungeons of the Lizard Priest adventure, on the final map. My wizard was hit with the card Bad Luck. He had Reliable Hide Armor which succeeds on a roll of 1+, sometimes known as "always." He was then hit with Entangling Net: I rolled a 1 for his Reliable Hide armor, admittedly, but this has always counted as a success before. This time it failed. This happened again when he used Bungled Bolt; Reliable Hide rolled a 1 and failed, and he took the damage.
I think all cards with a 1+ for a trigger should just always trigger and never require a roll. I'll log another bug for this one.