Change website viewed

I’ve just updated to Piwik 0.4.2.
I’m tracking two websites but can access to the first one only. When I click on the name of the second website name on the right top, nothing happens…

What can I do ?

Thank you for your help !

Go into Settings | Plugins, and try deactivating/re-activating the SitesManager plugin.

Thank you for your help, but it doesn’t work…

I’ve found a trick : in the url, I replace the idSite=1 by idSite=2…