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I am running Mac OS X 10.5.6 on my MacBook (2 Ghz Intel Core 2 Duo, aluminum unibody MacBook). [I also have a (almost?) 2 yr old iMac that I play Nexuiz 2.5.1 on]
Nexuiz 2.5.1 ran/runs fine on both my MacBook and iMac, with one exception: on both machines, about 1 in 10 games (but never the first game) freezes about 2-5 seconds after the match begins. This issue was addressed in this thread concerning freezing on Macs, where 'Lixi' suggested that the problem was the "sound thread lock bug" (AKA bug #21). Due to this annoyance, I decided to try out 2.5.2_beta (or whatever NEWEST version is called). Here are the results:
*** Sound bug (Bug # 21) appears to be fixed ***
I have played about 20 matches now, with no freezing. Now, this doesn't prove anything. I have probably gone this many matches w/o freezing before -- but probably only once! Usually I would have gotten a freeze by now.
*** Weird screen tilting after a hit ("motion blur") is working ***
I am not sure what new extras this NEWEST version includes, but one thing I immediately noticed is how my screen seems to tilt to one side or the other after getting hit. Is this the 'motion blur' effect that others mentioned, or is that something else?
*** Major sound problems -- almost no sound! ***
I don't seem to be hearing many sounds. Oftentimes I hear only silence. Here is a complete list of what I seem to be hearing:
(1) Picking up armor (all sizes ... the usual different sounds for the different sized armor pickups) [so, no, I do not hear *anything* when picking up health -- volume on high]
(2) When I hit another player with any weapon, there is a small hollow 'dink' sound. I think this is the normal sound, but it sounds strange on its own w/o the other usual weapon sounds.
(3) When another player hits me, I hear the 'splat' sound. Again, I think this is normal, but is sounds funny when listened to on its own.
(4) I hear the squishy exploding body sound (when gibs fly everywhere) when I kill an enemy or when an enemy kills me. However, I do not hear the dying player's screams, "ahahahhh..."
(5) I hear the ambient sounds of the level (if any). I'm not talking about jump pads (I don't hear those), I'm talking about the weird background sounds you hear in 'desert factory' (like hearing the sparks when I am near objects that have sparks flying off them). Many levels do not have any such background sounds. Another example of an ambient sound I do hear is the gurgling of the green ooze in the slime pit.
(6) I hear the flag-capture noise when capturing a flag, as well as the announcer's "flag captured" or "blue team scores".
(7) I am not super sure about this, but I *think* I hear some sort of noise when I am near a strength power-up that is just appearing.
That's it! I've fired most guns (not hook or jetpack though...) on several different levels. I've even sat around on a level to see if the "one minute remaining" warning sounds for me -- it doesn't. I only hear the sounds from the above [7] categories. No music, no gunfire, no jumping sounds, no announcer's "triple kill", etc. ...

I've checked the audio settings, and they seem to be normal. Any suggestions?