I do not know how it happened but the Settings File were damaged.
Thanks to Smith Micro's technical support (and many emails), I was able to repair my Moho 12 pro.
I followed this process:
Deactivate the software from the Moho 12 Pro Help menu.
Remove the Settings File for the application in the folder:
Users / <username> / AppData / Roaming / Smith Micro / Moho Pro / 12 / folder.
Restart the system.
OK

For now everything works well. We hope the thing is resolved definitively.
Thank you all for patience and for the advice given.
Hello