I have set up a multisite (sub directories) and all my plugins/CSS was working fine.
Then I added domain mapping and managed to point a domain
example.com to a site ID 4.
All still working fine.
However, when I make
example.com for site ID 4 'primary', the CSS seems to break. My plugins (e.g. responsive slider) no longer works, my CSS also. The moment I un-check the 'primary', all seems to work fine.
Any ideas what could be happening?