SmartFTP not starting on windows 8.1

Since i updated my windows 8 to windows 8.1, smartftp don't start anymore.
There is no error, the program is simply not lanching.
Of course, i'm using the latest version of smartftp. I tried to repair, but the problem is the same.
Smatftp worked fine before windows 8.1 upgrade.
I really need to finish my work before tomorrow and smartftp is storing all my passwords. How can i solve my problem ?

Thanks. It solves my problem.