I'm sorry for all the trouble, but turns out that my "grd" files have somehow became corrupted on the SD card, and that's why it didn't work. When i use "fresh" grd files, grids DO work!
I should have checked the grid files first before posting here about the build having a bug, sorry!
By the way, i had sent genosmm a few grids for him to try (my corrupted files), and that must be why grids didn't work for him either.
.
e