Line of sight is messed up through water, at least different from what I distinctly remember on Live. I use to run out in OT levitated over the water and easily cast on the melees who would chase and have to swim for a chance at my target ring.
Resists, also, are ridiculously fucked up, even after tash...:
www.tinyurl.com/10lifetaps
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The buff stacking thing is pretty annoying, a bug I noticed on Emu which game mechanic was different on Live. I located where it is controlled by the server but the spell code is so messy + lazy so I've never really attempted to fix it to the correct behavior. I'm sure it wouldn't be terribly hard to do though, but since bluebies don't really care about buff stackin 99% of the time (maybe for certain encounters?) it just has never been patched in the emulator code.
Another annoying stock emu bug is officers can remove the guild leader, which I think fucks everything up and the GM-Impossible has to go in and hand edit the DB tables to restore leadership...