Today we’re releasing a new Aseprite v1.2.28 and v1.3-beta5 version 
Including some bug fixes and performance improvements:
Aseprite v1.2.28
- Backported some features from v1.3: Full screen mode, redraw window immediately on “live resizing”, better handling of OS events.
- Improved the ellipse algorithm #2217
- Some performance improvements in the sprite editor #2713
- Fixed Color Wheel size to fit in its enclosing box #2737
- Fixed some crashes and problems with the “Remap” command of palette colors
- Fixed a problem where the color bar disappeared after resizing the window in certain ways
- Lua: Support using selection tools from
app.useTool()
Aseprite v1.3-beta5
- Regression saving certain GIF files when disposing frames #2806
- Fixed pixel perfect in Manual mode on Tilemap layers #2741
- Fixed big spot painted with full pression on first click after opening dynamics popup #2768
Remember to check the Aseprite v1.3 announcement just in case you missed it and to know how to switch to the beta branch.