Clicking on the new butten has no effect.

While working in a session of Solidworks when I want to start a new file
clicking on the new button has no effect. Likewise going to file new or using ctrl+N does not
work either. The only way I can open a new file is to close Solidworks and
launch a new session. Until today this would only happen once or twice a day
but today it is happening every 30 to 40 minutes. Any ideas?

SolidworksDrawings And Detailing