Weird phenomenon: popup menus can't be closed

[Dscho]

hello,

after replacing my NV GTX 980 by a GTX 1080 Ti, the popup menus like AutoStart, TQ, preferences and other don't react anymore and can't be closed. Drivers for the video card are updated. For the rest everything seems to work O.K. BTW I need to mention that my screen resolution is 4K  ( 3840 x 2160 ), plane version is 1.5.1 

Many thanks in advance for relevant ideas for what can be the reason !

Dscho

Edited October 16, 2018 by Dscho
supplement

[Renaissanceman]

I also have a 4K monitor, the popup menus to the right are quite small. Try going to the very right hand of your screen and (almost) the top . That's where my menus are.