You need to download newest Win64 version from OP and then replace the .JAR file with the newest updated .JAR file.Getting similar with the win64 version. (Tried both .exe and .jar versions that come with it.)
Try to save and it crashes, get a fatal error pop-up.
Also there is no error.txt file I can find at all...
Can't get a screenshot but it says:
Sorry, fatal error - please let Majalis know! An error.txt has been created in the game folder with the full details of the error.
Version: 0.3.13.2 Patron-Only
Error: Error copying source file: .toa-data\screenshot.jpg (Local)
To destination: .toa-data\save1.jpg (Local)
At least that helped me to save again normally.