And how do I make it go away?

Hi Sander,
 
The CA-2A should not appear in the region FX menu. This may be caused by some cruft created during the scan process. We recommend doing a reset and rescan in VST preferences. The procedure is outlined here:
 
http://www.cakewalk.com/Support/kb/reader.aspx/2007013315
 
Please let me know if this does not solve your problem.

Before you fix it, please save a snapshot of the inventory from your registry so I can see how this happens :)
Use Regedit to export it to a reg file and then send it to me. This post explains which keys to export.

For the first few days I had X3, Perfectspace appeared as a region effect, along with Melodyne and VVocal. I tried using it once and Sonar crashed, so I understand it did not belong there. I did not do the recommended reset. However, after I reinstalled Melodyne as the editor, I notice Perfectspace is not there any more. I mention this only in case it is helpful, and also because my automatic CWBRN-20024 can probably be ignored.

Noel, I sent you the registry keys.
Thanks Dan, that fixed it.