It seems that the game couldn't save character properties correctly in some environment.
When saving character properties file, real number is exported with comma (,) in some countries.
1.345 <- Real number with dot (I expected)
1,345 <- Real number with comma
So the game can't read number because it can't distinguish comma in number and separator.
As a result, the game failed to parse character file.
From this version (v1.31), the game save properties not as real number but as integer.
Of course, you can import existing character.