@NovaCoder
"But doesn't Fblit work by copying everything that needs to be rendered to FASTRAM"
That's the impression I was getting, so these two would be kinda doing the same thing. And so having both switched on may be causing the junk on the screen

Note that the garbage lines only appear when an icon is clicked on, as I said above. That's a clue.
Oh, and sorry I don't read everything I read these days you know, ADD.