Hello. First, try Vice on MacOS (https://vice-emu.sourceforge.io/macosx.html). It supports CRT format as well which is much more convenient (and faster) to play with (and no disk flips are necessary). I don't personally use Apple hardware nor had any experience with VirtualC64 but it may be a matter of basically anything, for instance, whether the fastloader runs on that emulator. Try to disable fastloader on the very first menu visible when running disk version and continue. Beware, loading times without fastloader will be painfully slow.