Something bizarre is happening in my setup that is causing everything to fail...
I reverted once more, and just tried to install 0.9.6.3.
The same thing happened where the pre-install check claims that config.inc.php is writable, but then the actual Install process claims that it is not and asks me to manually create the config.inc.php.
But then this time I get a NEW error message
Warning: fopen(/u2/gordon/WWW/modx-0.9.6.3/manager/media/style//login.html) [function.fopen]: failed to open stream: No such file or directory in /u2/gordon/WWW/modx-0.9.6.3/manager/includes/accesscontrol.inc.php on line 129
And indeed... when I got to the directory "media/style/" there are just directories like MODx, MODxGreen etc.
So the double slash // in the file name "style//login.html" suggests that somehow a name got omitted..
So basically it seems that there is some consistent problem that now prevents me from installing ANY version of MODx...