I believe what is happening is that the newer 32x32 matrix panels like we have are actually set up like 2 panels that are 16 wide by 32 tall and the data should be first shifted in for the left side of the display as if it was 16x32 and then the data for the right half should be shifted in as if it was a second 16x32 display.
I spent a lot of time reading through the library and tinkering with it, but it is a bit foreign to me and I have not been able to figure out how to modify it to work this way.