Harry you mean this solution?
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I found a work around. I forced non-sef url for Administrator (I'm super admin, so I have backend login, only admin must use front end admin). This was done through the very advanced tab, and changing the one parameter in sef404.class.php in /administrator/components/com_sef from super-admin to admin.
A bit crude, but it worked. When the admin logs into the front-end , he doesn't get sef url's, so the link to shop admin works
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I don't know what i have to do to get it working can you explain what you did to get it working?