(second case of this).
Using .48 the layout just for windows shows only as a couple of dots. There was nothing unusual with sizes of the window - I see .48 had some fix for mis-sized top/bottom.
The guy said it was fine last night and then this morning when he opened xlights the models were just the dots.
Any sequences would not render correctly (ie they are pretty much gone).
Hoping to attach a package bundle if he uploads it.