Why does Teradata Studio not launch (workspace error)?

Teradata Studio
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Why does Teradata Studio not launch (workspace error)?

Launching Teradata Studio (not Express) 15.10.01.01 in Windows 10 fails with error "The application cannot be started because its workspace is in use. Only one application can use the workspace at a time."

Problem is fixed with rebooting.  But is there solution not requiring that?