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When using Chameleon without PEAR installed, it is possible (and in fact likely) to get either a blank page or an internal server error. The problem is in the WidgetManager code that uses require_once 'PEAR/registry.php' ... as this is required for the installer only, and that isn't ready, I'll comment those lines out for now.
fixed in cvs.
closing bug chameleon currently works without pear...