ill be updating a version not susceptible to this but for now if you just delete (or rename) your ScreenshotCaptor.ini file in the program directory the error will dissapear. (or if you have settings you like you could just open up the ini and change the .0 numbers to ,0
the problem is that it saved the file in one locale, and you changed to another, and now when reading the ini its getting confused when it finds certain numbers with . in then when it expects ,