How to use the "Capture region by user selection" button?

[0x7FFFFFFFFFFFFFFF]

Hi,

I'm using the v1.1.5 portable version. When I click the top right corner "Capture region by user selection" button, nothing happened. I can't select anything. How can I just record a region? Thanks!

[nicolas-HORST]

It grays out the screen and you should be able to select where to record.
Mine is somehow not the correct size (not correct display adapter used)