Javascript detection error message the first time the TikiWiki page is reloaded or the first time a link to a subsequent page is called.
Great, thanks for checking Christoph, i've now pushed the fix to 21.x too so all the tiki sites should have that update soon.
If it all seems ok i'll backported it again into 18.x (which is where i need it!)
I'll update the wish on dev too...