Another armor bug for me: I've got some sparks which have hard to block (or I've got the Spark Generator activated). I'm sparking at Troggs with Crude Plates and they never get the -2 (or 3) to the roll. If they roll 4-6 it works all the time.
I disagree: Spark (dam 2, distance 6) is Hard to block 2. A few days ago I could see the dice changing from (for ex) 4 to 2. Now it no longer works.
You're correct - some electric cards have the hard to block effect (got distracted by the generator). But as Zoorland said, only affects block, not armor.
Hard to Block only applies to actual block cards, not to armor. Those are two separate types of cards using different mechanics. Flimsy Block, Weak Block, Block, Surging Block, Shield Block, Absorbing Block, Jarring Block, Parry, Weak Parry, Hard To Pin Down... these are a few examples of cards that are affected by Hard to Block.