Hi - my business website breaks when I apply X update to 6.3.8; I have a version working fine here, on http://www.rectanglered.com which uses 6.2.5, but when I update to 6.3.8 custom CSS breaks - see here on my staging site http://test.rectanglered.com . The only difference between the 2 sites is the version of X Iām using. All other content and plugins are the same.
Help please?