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Just downloaded the latest Sep 27th nightly (b7731c6) and the spell/breath effects are showing incorrectly in tile mode, at least for my tile set. Everything appears to be breathing time, which certainly makes exploring the early dungeon more exciting. 
("Yaaargggh!!! ...Oh, wait. Dragonfly.")
ASCII mode seems to be fine; not sure about the other tile sets, since I'm not familiar with the normal effects for those.
ETA: okay, now I'm deeper in the dungeon and I'm seeing acid instead of time for the same spell effects, so apparently it varies.
("Yaaargggh!!! ...Oh, wait. Dragonfly.")ASCII mode seems to be fine; not sure about the other tile sets, since I'm not familiar with the normal effects for those.
ETA: okay, now I'm deeper in the dungeon and I'm seeing acid instead of time for the same spell effects, so apparently it varies.