Seems like most mobs can track you while invisible. It may take some longer to realize you are there. Even when holding nothing and wearing no armor, mobs can track you.
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I had the same problem. But good news, 1.8 has a fix for this.
I'll admit it, its pretty scary when your in a nether fortress and you think your safe with your invisibility. That's when a wither skeleton strikes from behind & makes you jump out of your seat:/
SAME HERE! I've been searching the internet for the last hour trying to find someone else with this problem.
But yeah, it's ridiculous, creepers and skeletons all see me within the standard 16 block distance, even while invisible.
Zombies notice me from 100+ blocks away, but appearantly that's a new "feature".
Spiders don't seem to be affected by this bug.
Would be great if there was a fix for this, it currently seems like we're the only one with this game-breaking bug.