Spriter R5 64-bit doesn't save on Linux for me. Overwrites the file, with no data. Additionally the downloadable tar.gz is not a Tar file but a PKZip, so tar commands get confused.
Manual save and save new version only... auto-save weirdly makes a valid SCML on it's execution... dunno what to make of that.
Ubuntu MATE 15.10 64bit (updated to latest kernel)
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Gonna specify the save file fails /only/ if you don't identify an extension in the save box. If you identify the file as test.scml it works fine, otherwise it does not.