Dear Nicko,
We received your message reporting about the inability to make the location of SiteAdvisor toolbar stick in Internet Explorer while switching tabs with Google toolbar installed. Thank you for contacting us.
This is a known issue. The thread below discusses a similar issue in detail.
Site Advisor Icon. At this moment, there is no solution / work-around. A bug has been raised with our developers and they're working on the same.
However, in IE 6, the SiteAdvisor toolbar can be moved to any location and it'll remain there. In IE 7, the behaviour seems to be different though. Did you try locking the toolbars before switching / opening tabs?
Thank you for being a McAfee customer.
Praveen
McAfee SiteAdvisor Team