Set to fixed window but I still get the error message in Mirror Mode

[La Ballade]

I've made sure to set the osrs account to windowed mode on the original osrs client. I still get the error message when trying to start mirror mode

[Protoprize]

send screenshot of both clients open 

[lukey372]

4 hours ago, La Ballade said:

I've made sure to set the osrs account to windowed mode on the original osrs client. I still get the error message when trying to start mirror mode

Try rebooting your PC