Hi @Jonathan_Minchin
Shuji at Zwift HQ here. I looked at your server logs and as of May 8, your Windows computer was still using Zwift Launcher v1.1.1. This is a version that still had the blank screen bug. We’re on Launcher version 1.1.4 now, which no longer relies on Internet Explorer, and fixes this issue.
To update: do a complete uninstall & re-install of Zwift. Step by step instructions are here.
Please do the steps to protect your personal bests and custom workouts from being deleted.
Then pull down the latest game version from zwift.com/downloads