Syncplay 1.3.0 users can ignore this release unless they are using Syncplay with mpv on Windows.
This minor release fixes a compatibility issue with mpv 0.10.0+ on Windows. The issue was caused by mpv removing support for a command line switch which Syncplay was using. The switch was itself being used for compatibility with an earlier version of mpv, so this change may require you to update to a more recent version of mpv. Thanks to wiiaboo for so quickly making a pull request with a fix for this issue.
Windows installer: http://syncplay.pl/Syncplay_1.3.1_Setup.exe
Windows portable: http://syncplay.pl/Syncplay-v1.3.1-Portable.zip
Source code repository: https://github.com/Syncplay/syncplay