I have updated to php 7.4, have Cornerstone 6.1.4 installed, and am trying to upgrade from theme X version 8.3.2 to 9.1.4. I’ve turned off caching, turned off plugins, cleared and updated the Style Cache, exported and imported the XCS file, and the still breaks completely whenever trying to upgrade the theme.
I’ve been knocking my head against the wall to fix this for a couple weeks and have come up empty. Thanks for any support.