Just encountered some issues with css not sticking on 4.0.7 – specifically I’m having problems with css tweaks to the header and logo area. On certain pages I have an alternate logo and am achieving this using .logo:before. For some reason psuedo css doesn’t stick. I also experienced SVG (when set as the logo image) aligning super strange on 4.0.7.
Reverting back to 4.0.5 fixed my issues.