Vista on PC no external Window?

Just may be a glitch but running Vista on a PC and it is not allowing me to open an external window. Same showfile on Mac and no problems. Any suggestions?
V3 19088 windows 10![image|374x500](upload://eB

Do you have a second monitor attached and detected in Windows?

Not sure if it is just me but I can’t see the picture.

I will try that shortly. I was trying to build my busking sheet pre-show.

That was the trick. I was working on a convention center showfile but I made it work!