I have exactly the same error occurring on my page, although in this case there is no tabstrip. My editor is contained in an UpdatePanel, so I'm guessing this is a cause of the problem.
The suggested workaround is OK for productive websites, but compilation debug="false" is not an appropriate workaround when I am developing, the debug mode is essential for me.
Can you please investigate this issue further and advise? This is occurring with the most recent build of the "Prometheus" RadEditor if that helps.
Let me know if you need further information, but the error message about
"Two components with the same id ...._toolbarMode" is the same for me.