Please download and install the latest version of Mindmanager 7 (currently 7.2) from the Mindjet Download Center at http://www.mindjet.com/resources/downloads/archive/default.aspx. This will solve the issue.

Alternatively you can download, extract and execute the following Zip file: http://www1.mindjet.de/downloads/support/interface.zip 

This registry file resets your MindManager user interface settings.