i think i know of a few bugs but don't remember if they were AMOS 1.3 or AMOS Pro, will have to try. One was that when using Gr Writing to draw in XOR mode to do "rubber banding", the Box command used to leave pixels from the corners all over the screen, unpredictably.
I could "fix" the music extension to play tracker modules properly since i already wrote my own extension for that
tbh i think AMOS 3.0 should be a complete rewrite, i know it's a big project but there's too much legacy.
also do you know if there is a way to load a different 8x8 font? It came with an 8x8 font editor, but there doesn't seem to be any way to use a different one.