When I try to close a project in Sonar X3e, I am getting a message that it cannot be closed because Melodyne Singletrack is open as a Rewire device and must be closed first.  But I can't find it.  I did have one instance of that in the FX bin in a vocal track and I deleted that from the FX bin, but am still getting the message so I can't close Sonar.  I checked the FX bins of all vocal tracks but can't find any instance of it. 
 
The Sonar help file emphasizes that you must close all Rewire applications before closing a project, but there is nothing I can find that tells you how to do that.  Is there any place in the program to see where it might be lurking?  Thanks.
 
(The reason I was trying the Singetrack Rewire plugin is because Cakewalk suggested it since I was having a problem with Melodyne Editor in the ARA version.  Now I MAY have solved that problem, but I need to close this project.)

It should be open on the screen somewhere. If not, it must still be open as a process in the Windows Task Manager.

scook, thanks for the quick response and the suggestion, which worked!  It could not be seen on the program view, but was sitting in the Task Manager.  I got rid of it and can now get back to work.  Yay!