Preview problem (Blocs 3.3)

Hello forum users,

I have a question. Maybe you have the same problem and know a solution. When I start Blocs and open my project. And then later want to look at the project. I always get the following error message:

“Not Found”

The requested resource /?8020 was not found on this server.

And then has to complete Blocs always complete and then someday then goes the preview.

Maybe it’s a bug too.