Commenting on the block -- and based on what I've seen in the 'other' thread about cooldowns, lag, etc. -- here's my $0.02. Unlike most of the other combat abilties block is 'hold to use' rather than 'press to enable'. With that in mind it doesn't make any sense to me that game does not try its damned best to enable block…
Ran into this issue several times today -- for me, what works, is this: - Alt tab from-and-back to the game. - Hit keys (often there would be message 'hit any key' after alt-tabbing back).