This is what I see now in SystemInfo.py
BoxInfo.setItem("MaxPIPSize", model in ("hd51", "h7", "vs1500", "e4hd") and (360, 288) or (540, 432))
It seems for VU it is not limited to 1/4 of a screen but on 540x432.... full size is here 720x576!!! And I see exceptions for some boxes but I already know there are more boxes that need limitations.... I'm afraid we need at least change the 540 432 to 720 576... (it is based on SD resolution as kind of overlay). Somehow this was 'never' maintained....