it is working here, but i'm using a uae rtg card (picasso96) 800x600.
are you using aga screen? if so, install
p96 and change screenmode of the workbench to an uae screenmode -
unofficial p96.
when i quit mines i do not get an error.
#1) my filesize differs a bit, i put my mines binary into the zone: Mines.lha
*image removed to free some bytes*