I've now found the cause of the original problem, it's a bug in SharePoint. I've blogged about it at http://blog.salamandersoft.co.uk/index.php/2009/06/sharepoint-bug-in-spweb-allrolesforcurrentuser/
Richard
SLK Co-ordinator
Read the complete post at http://slk.codeplex.com/Thread/View.aspx?ThreadId=34441
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