Important bug fixes on Aseprite v1.2-beta6:

• Added option to export (File > Save Copy As) with pixel aspect ratio
• Fixed bug/crash moving a group inside itself
• Fixed bug moving cels one pixel up or to the left
• Fixed rendering artifacts
• +All changes in v1.1.12

Aseprite v1.1.12 fixes:

• Added option to disable Home tab
• Don't ignore the initial frame number option in tag properties dialog
• Fixed crash using focus-movement keys on certain strange UI states
• Fixed other minor bugs

More information in Aseprite blog announcement.