After the UI change there seem to be some sort of problem with abilities to notice they been activated.
Had a PvP game where I was 1vs1 against another tank and we just stood still in front of each other and bashed for the fun of it and half my spells didn't activate.
I mean how hard is it to get rocket punch off when you stand in front of someone? not at all. Did it fire? Nope, had to use another spell in-between to get it working.
So something funky is going on, again, still.