I just recreated your site and there is definitely a Joomla bug - if you enable maximum error reporting (server tab of Joomla config) you get an error message
Notice: Undefined property: JSite::$registeredurlparams in /black/var/www/clients/joomla3production/libraries/joomla/cache/cache.php on line 658
A search on google (
https://www.google.co.uk/search?client= ... 94&bih=759) suggests its been reported but there is no solution that I see so far other than disabling joomla caching for the time being.
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