DescentBB

When I press the paste touching button nothing happens so I have to change each texture one by one.
The thing is, it used to work normally but now it doesn't.
How can I fix this?

Make sure:
- The sides are actually adjacent (look at the cubes; if the cube next the cube you're trying to align is not the cube with the other side, the sides aren't adjacent). There is a fix in using the "Align All Sides" checkbox, but you have to be careful as weird stuff can happen (including the other side of a door being flipped upside-down if it uses the same texture as the room you're editing).
- You have "Align 1st" (or whatever it's called) below the texture preview selected. Just having 2nd selected means that the primary texture won't do jack when you press align.

More precisely, "use 1st", but that would be my guess as well. Those two checkboxes control how DLE decides what the edge of the "touching" region is for purposes of pasting and aligning textures. If "use 1st" is checked, it compares base textures; if "use 2nd" is checked, it compares overlay textures; and if both are checked, they both have to match.
I forget what happens if neither is checked but that might be a problem too