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Lately when I've tried to export .json files from RUBE, every vertex is saved at position 0,0. The world position of the body will save however, it's just the local positions of the vertices. A .rube will save the file correctly.

Is this a bug? Or have I tampered with any settings by mistake?
When I first used it, I created a number of .json examples that were working fine. My version of RUBE is the purchased version by the way.

So if you create a new scene, add a body with a polygon fixture (eg. square) and export that to .json the vertices are all zero? Or is it just with scenes you have been using previously, that have various settings associated with them?

Are you using Linux with a locale other than en_US.utf8 ?

Does the resulting file have the correct number of vertices exported?

Have you unchecked anything in the "Included properties" section of the scene settings? (Scene settings dialog, Export option tab, at the bottom). How about the three options just above that, under "Use human-readable floats in JSON", what are they set to?