ForScore giving landscape 'Display Mode' options when in portrait mode

[Wayne Richmond]

Hi, Every now and then ForScore only gives me Landscape 'Display Mode' options even though I am in Portrait Mode. This means I can't access 'half-page' turns. It was doing this a few days ago but after hours of fiddling it suddenly fixed itself. But it has happened again now. Does anyone know why this is happening and how I can fix it?