Hello, i have download the last version (9.2.0) and it´s look like it has the same problem but i wrote my credentials in a txt file, copy and paste them and push the green button and finally i opened the mendix studio.
If someone have the same problem try although the textbox looks empty and the button dont have any caption.
Regards.
Hi Lamine, I don't know why but it didn't happen me again now when I open the application works right:
Sorry but the only way i found to login was copy / paste the credentials.
Regards.