Game Message:
Today's update to CivWorld has been completed. Thanks for your patience. Enjoy!
There's a 'next message' arrow, but clicking it does nothing.

Also, clicking in the cross/X on top right does not close the message dialog.

Only way to continue was to refresh the page.

After doing so, the same game message appears but without the 'next message' arrow, and it's possible to close it (OK).