I have just upgraded to Magento 188.8.131.52 from 184.108.40.206
In the CMS > Pages when I create a new page and link it to a custom multi-store views, the preview does not work. Curiously, the same page if it is set as a home page via the admin > configuration, in the browser this works fine.
Also , the same page, if it is linked to the default website (Madison) the CMS preview also works fine.
On my earlier 220.127.116.11 installation, I believe I have had a corrupted cache issue and hence the upgrade to 18.104.22.168. I am on shared hosting at the moment
I am not using any "Blocks" hence no permission issues, I have also cleared the var/cache a number of times.