Blender: Border Rendering Is Not Supported by Sequencer

Disabling Render Region fixed the problem for me.

Turning off border rendering (render region blender 2.8) in Rendering -> Properties -> Output properties fixed it for me.

I recall playing with menus and the hypothesis is that I checked it somewhere along the way to cause that problem in the first place.

I cant comment yet bc of reputation apparently, so I guess I have to leave my comment behind here. I do have an answer but I'm not sure if it is a correct one.

I had the same problem, and I think i fixed it by unchecking the sequencer box under Post processing in the same tab as where you edit the format and encoding etc. But now that it does let me render my video (just a picture with audio under it) the render result is audio only? Could be a seperate problem or part of this solution, idk. Would unchecking that box help for you?

The answer for me on the same exact issue was the Crop to Render setting you can check or uncheck. I checked it and voila! I can render again. Thought that might help someone. It is under the Output tab and it is right below Render Region setting.