I work mainly in the score editor in Cubase 8, entering notes by hand (mouse) into my orchestral template.
Was working on the oboe stave - fine, no problems - then I went to enter a minim in one of the violin stave I got a double-headed minim. Any note I enter is double headed. I cannot just delete one of the heads - if I delete it the whole note disappears. It sounds fine, but obviously looks very messy. On experimentation I find that this happens with numerous staves, but I can’t find a setting that would do this. Similarly, I can’t find any difference in settings between staves that have this problem and staves that don’t!
I’ve shut Cubase down now and I’m leaving it alone til tomorrow as I was starting to get furious!
Any idea why this might be happening?