When saving your quest in zquest, it reverts to the default Zelda1 tileset. Although it appears ok after saving, reloading in the editor or playing it in zelda.exe shows the problem.
This happened after loading up a previous quest from build 116 and also creating a new quest after importing the graphics pack.
It seems that only the tiles change though, the palletes and combos stay the same.
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EDIT - further testing.
Only occurs loading quests or importing graphics packs from previous versions
I started a new quest, imported tiles and combos.
Tried to import palette, said it failed.
Quit.
Started up Zquest and loaded quest again.
Palette was fine for some reason.
But the important thing is, i saved the ~new~ test quest. Quit. Loaded it up again and the tiles were fine.