As far as I know, the issue has been fixed.
When such problem happens again, just rebuild cache in your X-Cart store manually, as follows:
1) Close all your web-site's pages (if any is opened in your browser).
2) Remove var/run folder and var/.rebuildStarted file in your X-Cart installation.
3) Open the X-Cart admin page in your browser, in order to initiate the cache re-generation process( for example:
http://www.sportingoutbacksupplies.com.au/admin.php).