All save game data is stored online on Ubisoft's servers.
convert: Read Exception `/tmp/localcopy_bdca5fe767fd.png' @ error/png.c/MagickPNGErrorHandler/1628.
convert: no images defined `/tmp/transform_de14b19cd0fe.png' @ error/convert.c/ConvertImageCommand/3258.
Default controller mapping
Locking the framerate at 30 fps (in video options) seems to alleviate most of the problems, resulting in much smoother overall gameplay.
Can give greater stability boost than above. Combine both.
Developer is informed about the issue.
The problem is entirely fixed by these driver's version and later.