Flavio Pane (http://www.flapane.com/) made me aware that QtOctave doesn't start on OS X 10.4 for powerPC architecture. I don't have a ppc anymore, so I have some issues in debugging it. I've rebuilt QtOctave with 10.4 sdk and updated the software section... You may try it, and tell me if it works!
[Update Sep 15]: Apparently it works now on Tiger/PPC... great!
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