Just another voice here to say yes it's not working on an A500 (I have the ACA500Plus setup too, but even knocking up an A500 with 3.1 roms inside FS-UAE gets the same result). I bought it really just to show a bit of support but I do think that either it needs fixing on the 68000 chip, or A-EON remove the 'A500' bit from the website (sadly, I know which is easier to do!)
Happy to help test anything going forwards in terms of trial builds, patches etc. I'm a developer by trade myself, over 30 years, so I have some sense of collecting crash logs and writing meaningful bug reports etc.