I've heard mention of all sorts of bugginess, from some people not getting xp (while others claim to have gotten xp). I have also heard that the new death options make dying in an MM (i.e. the Dains) go all buggy as well...
...I'd think its only bugs that are causing any problems, but the question is how concerned they are with content from what is now an older expansion.
I personally did the Kith MM twice and didn't recieve any AA xp. Everybody else in my group was doing regular xp and didn't have a problem. GM's wouldn't help me out either... so I grumbled and got over it (I hate wasted EQ sessions). However, the newest patch claims that they fixed the bug. So that's good.
The ej2 mm To Raise the King, were giving 179% aa xp from last Sat until the patch on Wednesday. Now they are back to 91% aa xp. It was a sweet bug while it lasted.