I've tried searching a little but I can't find any info on this. I had to use my sporebat in the raid last night as we were missing spell haste, and noticed that I could not use Focus Fire at all - Frenzy did not appear to be stacking and everytime I tried to mash Focus Fire I kept getting the "Ability is not ready yet" error. After the raid I took it out into the wild to test it on random mobs, and it still did not work. I then took out a different pet, and it worked perfectly with Frenzy stacking. Summoned sporebat again, and it wouldn't work. I even tried switching it's spec around a few times to see if it would 'reset' something, but to no avail.
Has anyone else noticed this, with sporebat or even any other pet? My 10 man raid pretty consistently lacks spell haste, so this sucks! My dps was quite a chunk lower than it had been the previous night when I was using a different pet with focus fire working as normal.
Thanks for any input