Hi...have a work around, but running into wierdness with 6.0 build 766.
When I add a child table with a relationship to a master table and include 'Display number of child records', 'preview' and 'display master table' checked on the Table link properties AND I have Dynamic permissions enabled, I get page 500 error upon attempting to access the master table list screen (or sometimes it shows the table, number of records and page selectors but no records.
My work around has been to uncheck all of the boxes on the Table Link properties except 'No Preview' and drop the login, rebuild, re-add login, rebuild and then all is well. I am not sure yet which exact thing is causing or fixing this but wondered if anyone else had the same experience and had figured it out.