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I have used this audacity for quite a time with no problems. Today, I started the program and nothing appeared although when trying again the message “Another session has already started…” appeared. In Task Manager there was a session started. Stopped it but same problem again. Uninstalled and reinstalled with both existing and then new download of program. It gets to the small Audacity logo on the screen and stops there. Eventually “No response” is shown. No changes have been made to the computer.

Which version of Audacity do you have?
Have you tried rebooting the computer?