Ruby mapscript oddness

[The Cunctator]

I'm happy to give settings/sample files etc but maybe someone has some idea
what my problem is -- I'm guessing it has to do with the installation.

The following script:

#!/usr/bin/env ruby

require "mapscript"
include Mapscript

map=MapObj.new("test.map")
image = map.draw
image.save('test.png')

fails:

in `draw': msEvalExpresssion: Expression parser error. Failed to parse
expression;msyyparse(): Expression parser error. syntax
error;msEvalExpression: Expression parser error. Failed to parse
expression;msyyparse():
...

etc.

whereas the php script

<?php
if(!extension_loaded("MapScript")) {
   dl('php_mapscript.'.PHP_SHLIB_SUFFIX);
}

$map = ms_newMapObj("test.map");

$image = $map->draw();
$image->saveImage('test.png');

?>

works fine.

map.drawLegend
and
map.drawScalebar
work fine.

Anyone have thoughts or what information would people need to diagnose?
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