After upgrading to 2.5.5, the top right link that links & redirects to the client site is not working.
The link is there, and generates the correct URL, but redirect never happens and we're stuck with the blank page:
http://www.clientsite.com/?URL=http://www.clientsite.com/
What could be causing this issue?
Thanks everyone!
P.S. Unfortunately none of the solutions at the related Control Panel (CP) Link Button is not working issue worked.