There is an AO bug in the current Firestorm Release 6.3.9, which has already been fixed for next release. We are sorry it made it into release, as it has been frustrating for some users. In the meantime, we provide 2 step-by-step methods to workaround the issue here Firestorm Wiki - AO crash on login It's your choice of course, but for others, there's no reason not to ever use the AO again. The Client AO works just as it always has once this hurdle is overcome. 
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