I started using the AF_Grid2:Grid_Window as a base and modified it to have all the features I wanted - it wasn't working perfectly but I had it at about 98% reliable... the things it didn't do well were minor.
Anyhow, I upgraded to the newest RDX and now it blows up.
The AF_Grid2:Grid_Window_alpha still works so it's obviously something I did, but I'm not sure how to figure out what feature I blew up.
Attached to this post is errors.txt, this is a copy/paste of the relevant errors when I try to draw the window. I think the relevant error is the one about more than 66 upvalues but i'm not sure what that means!