I have run a number of tests on the bow enhancements for my arcane ranger, and they are borked ... the +5 that is supposed to get applied to bows if you've gone up the tree through "shadow arrows" simply doesn't work. The Runebow +2 enhancement is the only bow enhancement currently working.
At least under the old system, you could conjure +5 arrows that actually worked. This is really sad. I have to make sure my AA is using +5 bows in all cases to get the same effect the enhancements are supposed to give, and that's not always possible, even for a level 18 ranger. And, since I've yet to see a +6 bow, the bow enhancement in the AA capstone can't be compensated for.
I know it's listed in the known issues, but is there a fix being worked on for this? And is there an ETA for when will it actually get released? I've noticed that once something is put on the known issues list, it seems to stay there forever, almost as if once it's been documented it falls off the radar screen.