I'm on OS X yosemite, Synfig don't open have you any solution to fix that, My Mac tell me "verification of Synfig" and that's all. The It stays with this error message for hours... What did I do ?
Hello! Starting from October 13, 2017 we are providing optimized package for OSX users, which should eliminate the problem you have. Please check which package you use - if size is about 500 Mb then it is not the optimized one. The size of optimized one is about 100Mb.
Please check details here - https://morevnaproject.org/2017/10/13/osx-version-synfig-now-5-times-smaller/
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