I've updated the Issue Magazine (Upfront) Theme, but now the frontpage is broken. Maybe interesting, this is an older issue: I'm only able to access the Upfront frontend interface in Safari browser (not Chrome and Opera).
When I started a year ago or so with Upfront I had issues with caching on my server, but everything is disabled. So also for the frontpage it should not be an issue (where in the builder right now I've put it as it was, but it's not showing up live). This I already checked with the hosting-company.
PS: I've granted support acces.