I got bit with some similar "font" bug earlier, in my Wheel of Fortune spoof. I ran perfectly in V2.0 and 1.5 but did not pick up _FONTWIDTH, _FONTHEIGHT the same in 1.3 and 1.4.
Pete
Probably the same issue. From the screenshots, it's obvious there was a bug fix introduced into the source. Before 1.5, that "MONOSPACE" wasn't auto-spacing fonts at all.
Run this as a print under Bplus's "Hello World" code.
PRINT "HWHW".
PRINT "llll".
If the fonts are monospaced, both outputs should use the same screen width. In 1.5, they do. Before that, they're bugged.
HWHW
llllVs.
HWHW
llll