Mari 3.0 viewport problem (solving problem)

If you use Mari 2.6 and then installed the 3.0 and Mari have problems with the viewport like me, there is a method of treatment.

You need to find the folder .mari on the path C:\ Users\ __USER__\.mari  (Windows 7) and simply rename (if you use prevision version Mari 2.x) or delete it - full reset settings. Or rename/remove *.ini file on the path C:\Users\__USER__\.mari\TheFoundry\Mari.ini. And it's all =)