Musescore has been working fine up till today where Musescore will not play any sound what so ever. Everything else work, it just won't play any sound. Im using the latest version of Musescore and I'm running OS X Yosemite.
Please ask for help on the support forum - the issue tracker is for confirmed bugs only. I am guessing you inadvertently removed the soundfont or changed the option telling MuseScore where to find its soundfont. When you post your question to the support forum, please say what settings you see in Edit / Preferences / General l / Soundfonts and Edit / Preferences / I/O, and what soundfonts you see loaded in View / Synthesizer.
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Please ask for help on the support forum - the issue tracker is for confirmed bugs only. I am guessing you inadvertently removed the soundfont or changed the option telling MuseScore where to find its soundfont. When you post your question to the support forum, please say what settings you see in Edit / Preferences / General l / Soundfonts and Edit / Preferences / I/O, and what soundfonts you see loaded in View / Synthesizer.