Regarding the red artifacts, what macOS version are you running? If you’re on 10.14 (Mojave), there are known graphical issues on that OS. If so, we suggest upgrading to 10.15 (Catalina) or higher.
If you’re already running macOS 10.15 or higher, could you file a bug report (F12) with screenshots of the issue? This will also give us more detailed system specification information we can use to troubleshoot the issue.