MuseScore 1.3 is mainly a bug fix release. Two bugs causing a major nuisance and a dozen of smaller ones have been fixed. No new features have been added. The translations and the handbooks have been updated.

Bug fixes

Playback
Fix #19148: Distortion in sound playback after several measures of play due to reverb
Improve the stability of the sequencer and user interface interaction

Crashes
Fix crash when loading files with invalid tuplet
Fix crash when exporting parts with voltas
Fix possible crash during MusicXML import
Fix crash when changing voices without valid input state

User Interface
Fix #16692: Save and Save As dialogue boxes fail to open when Title contains colon
Fix last element in file format combo box in the File -> Open Dialog is empty on Mac OS X
Fix Two percussion clefs in palette
Fix #16301: Verbose program listing in Add/Remove Programs
Change default shortcut for voices to Ctrl + Alt + Voice number (Previous shortcuts were not working on Mac)
Fix small icons on Windows and Mac
Add 1024x1024 icons on Mac OSX for retina display
Fix: Fermata applied to rest isn’t positioned where it was placed until score is saved and re-opened
Better looking new score wizard on Mac OS X
Fix: Two invisible boxes in 'Lines'

Updates

Installer
Windows binaries are now signed with an Authenticode certificate
Windows installer is also available in MSI format to ease the deployment of MuseScore through Group Policy
Both Windows installers are signed with an Authenticode certificate

Plugins
Updated musescore.com “Save online” plugin, cosmetic changes
Updated ABC import plugin, support for larger files