New in Acorn 5.5.2 Build 11339 (September 16th, 2016)
Fixed a problem where instant alpha sometimes didn't work on layers with lots of transparency.
Fixed a random crash on 10.12 when using undo/redo on bitmap layers.
Using the flood fill tool on an empty bitmap layer is now super fast.
The new Dither filter was accidentally showing up in 10.10, when it should have been 10.11 and later.
Accidentally improved performance when using undo or redo.