The mesh shader is red and nothing shows up in the viewport.

[rosstheblenderanimator]

Does anybody know why this might be happening?

[rosstheblenderanimator]

Also the tiny black window does not show up.

[eballeste]

hey, you should report this as a possible bug, you'll get to fill in more details that would help Miguel troubleshoot your issue a lot better

it also has a link to the readme file so you can make sure that you have everything setup correctly before reporting the issue

https://github.com/bnpr/Malt/issues/new?assignees=&labels=&projects=&template=bug_report.yml