Failed to save export preset

[Bit Barrel Media]

At some time in space my project suddenly started throwing errors when I save the project. I get a whole list of these, for all presets. This is just one of them:

[ResourceExportPreset] Failed to save export preset.
file:///C:/Program Files/Allegorithmic/Substance Painter 2/resources/shelf/allegorithmic/export-presets/Unity 5 (Standard Metallic).spexp

[Froyok]

Please attach your log file : https://support.allegorithmic.com/documentation/display/SPDOC/Exporting+the+log+file

[Bit Barrel Media]

I deleted all materials from the stack, restarted the computer and now the problem disappeared. I can't reproduce it now, but if I do, I will post the log file.