The program opens but then freezes. Nothing works at all. Even the Exit cross in the top right corner doesn't work. The only way to exit is to open task manager. (Windows 10)
@Steve-Roud5196 Which version are you using? Old versions can freeze on newer Windows 10 versions. You can change the rendering mode by editing MxQt.cfg in the program directory and with a texteditor.
Change
[QtOpenGlEngine] QT_OPENGL=angle
to
[QtOpenGlEngine] QT_OPENGL=software
In case there is a #-character, you need to delete that too.