In all of my projects the blender file stopped working. It only shows a black backround. I tried to resave the file in both formats, but its still not fixed. I havent done anything what could have changed any settings in my projects, as I havent looked at them for a while. The only think changed was my webflow account running out. Do you need an existing webflow account for the projects to work?
As this problems is happening to all of my projects Im assuming its some common setting?
I will try to help. So I am clear on the process that is causing the black screen.
You have exported your blend as a GLTF and saved it in the applications folder containing your project.
You then used the App Manager and opened your application to verify that it is pulling up and functioning as expected.
It is at this point the project is black?
If you had a paid account and hosted the application on a webflow server, they may have deleted or suspended your access to that content.
If you could provide more detail I might be able to assist more.