I've connected duet display before to my PC and it was fine, I then had to repair the files and re-download when it was stuck on the connecting screen on the Ipad. It then worked twice after that and one day i turned it on and had it portrait and it firstly turned my screen sideways on my PC, i then turned my Ipad landscape and my screen went back to normal. However the Ipad screen was still glitching, I have black bars above the top and bottom, its mirroring my normal monitor and when I move my mouse it takes a part of the image behind with it and it generally just flickers. can someone help please? Thanks!