XnView Software

If do this :
in folder c:\Program Files\XnViewMP place this files
and next press F11 for view settings or manage database , so in final will uncorrect theme , before in version 1.80 and same this bug was absent

The cause of the manifestation of the error :
If in c:\Users\Username\AppData\Roaming\XnViewMP\
absent files :

style_sheet.qss
style_sheet_win.qss
xnview.ini

but this files available in folder with XnViewMP , so XnView MP will generate this files in

c:\Users\Username\AppData\Roaming\XnViewMP\

and because theme work not correctly

I offer do so , what if XnView detect files :

xnview.ini
style_sheet.qss
style_sheet_win.qss

in folder where install program , so use only this files and not will try write or use files in )

c:\Users\Username\AppData\Roaming\XnViewMP\