I downloaded the Mac OS X PPC Python 2.3 10.3+ version of blender. I tried the array3.blend I found on blendernation. After the animation was done, I clicked the play button and nothing happened.
I tried the same file with 2.42RC3 and the play button played the animation back. When I compiled 2.42 on my powerbook G4 the play button works.
My system is Mac OS 10.4.7, with python 2.3 and ATI Mobility Radeon 9700 graphics card.