Sure, my bad
So I have some custom meshes. Each of them have custom name “SimpleCube”, “SimpleCube2” etc.
When I press + and then OK it starts adding mesh, after that it start rendering and it stuck on “Thumbnail rendering” text. I’ve been waiting about 15 minutes but without results, then I pressed “Chech/Hide console” and in console there is an error “Error: Cannot read file ‘C:\WINDOWS\system32\SimpleCube’: No such file or directory”. First of all, I don’t know why he trying find my asset here. Sometimes location is when Blender is installed.
Well, it seems that i’m using old version. I need to update my Asset Management addon, but I will do it tomorrow. Maybe this is a solution.