#Edit#
Can the forum admin please move this to the J! 1.5 Legacy section, sorry I posted it here by mistake

J! 1.5 Stable
RSG build 634
SEO setting fully on, including mod_rewrite
#edit# legacy mode enabled
Getting a strange error, not sure if this is RSG, J! or something else?
I have created a menu link to RSG, the menu manager shows the link as : index.php?option=com_rsgallery2
When clicking on the menu idea on the front end I am taken to :
http://localhost/index.php?Itemid=219&option= and get a 404 error
With SEO turned off
Back end menu link still shows : index.php?option=com_rsgallery2
on clicking on link I am taken to url :
http://localhost/index.php?option=com_rsgallery2&Itemid=219Page displays ok.
I have only seen this error since upgrading to build 634 but have installed some other components since then. I have disabled these components but still getting the same issue.