To everyone having problems: read the goddamn FAQ. I don't see a single question here that is not being answered in the FAQ.
Except for shooowop's: that is a general DF problem.
Please try to remember the details of tile sets are quite arcane for alot of us. I've read through the tutorial and FAQ on your site but its not helping me determine if what ive encountered is indeed a bug or if it is working as intended.
I've loaded a save game from 31.04 into DFG32 and the unmined soil/stone etc is showing up with vermin/trees and other object's graphics on the stone tiles.
Having read through the FAQ either Note 1 or 7 could explain what i've encountered potentially. Is what i've described an issue you're familiar with or have i ran into something else that you need to know about? i'm not particularly worried about fixing it so much as making sure you're aware if its a unique issue.