Never had that issue and I'm also unable to reproduce. Seems like an autoloading issue. What version of PHP are you using?
PHP 5.3.3-7+squeeze15 with Suhosin-Patch (cli) (built: Mar 4 2013 14:05:25) Copyright (c) 1997-2009 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies with Suhosin v0.9.32.1, Copyright (c) 2007-2010, by SektionEins GmbH
~Thomas
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