CMS Made Simple Forums

I have set up an availability calendar that was working perfectly prior to my site move. The template is below:
However, post move, the {cms_stylesheet} tag seems to be being ignored as there's no css being output. All other pages of the site work fine, so I can only assume it's something to do with including the availability calendar. It was working fine prior to the move. Anyone got any ideas? Thanks in advance!

Problem was a multiple database issue. Worked on one hosting provider, but not another. Brought the calendar database into the CMSMS database and all was well.