you can give your WHDLoad problems to the WHDLOAd team.
I found a bug with Gloom when I using an A1200 with ACA 1233/40 MHz. The problem was the walls disappeared. If I try the same game on a Blizzard 1230 IV I don't get this problem.
WHDLoad installed games won't work with all Accelerator cards. I also have some issues with games when running on a GVP 1230II.