Im curious as to why anyone is testing a beta that features tanks that dont die and bulletproof planes. Are these new features that are being developed for the game? I think not.. Anyone who is testing a beta version in the main arenas should announce it at some point to any attacker instead of just letting it go on and pissing off everyone.. as is happening here..
Pakrat, 64 bit doesn't do that anymore, a newer version is up. At least it doesn't happen to me and I haven't seen it happening in the game recently. If something like that would happen to me, i'd quit using it where it is wrong and report the problem.
Since you have/had framerate problems maybe you should try it out as well, as it is supposed to increase frame rate, which I haven't checked yet. It won't overwrite your current version. Check the mac forum here for more 64 bit insight from some who are using it or trying to.