From GA further up this thread...
It's a known issue with v1.26 of BlitzMax. This has been fixed in v1.28, which should be out in the not too distant future. There is a quick fix, but Grey chose not to implement it as it was previously mentioned that v1.28 would be out in a day or so (unfortunately, this was about a week ago now!).
Oh btw, the Mac version above should exhibit a current BMax bug where changing to and from windowed mode screws up all the graphics completely! But Mark thinks he has fixed this so roll on V1.28...
It's a known issue with v1.26 of BlitzMax. This has been fixed in v1.28, which should be out in the not too distant future. There is a quick fix, but Grey chose not to implement it as it was previously mentioned that v1.28 would be out in a day or so (unfortunately, this was about a week ago now!).