Eyjolf This one should not prevent it from starting. Can you please send full log to support@tonfotos.com?

Thank you for the support. There was nothing wrong.
Windows+Alt+Space did the trick to open up the application window.

I think I found the reason why the Tonfotos window did not show up (Windows 10). I have two screens one big I always use and one small that I sometimes use. I found out that if Tonfotos opens up in the same screen as last time even if the screen is turned off and not available to the oparating system. It is an easy fix, when you know this, by turning on the extra screen but it would be nice if the software would detect the current screen configuration on startup.