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TeamViewer 14 gone blank in Mojave

I have TeamViewer 14.1.9025 install on Mac OS 10.14.2 (Mojave).  On occasion the client interface does not respond to any of the menus.  You can select a menu title Remote Control, Meeting, Computers & Contacts, Chat but there is no information in the response area.  I cannot click the Sign In option.  The only workaround is to end the program and restart.