HI rgturner-
Eventide Plug-ins are installed to the following locations on Windows, please make sure that you have Cakewalk set to look at the appropriate folder (based on if your version of SONAR is 32-bit or 64-bit).
-VST32: c:Program Files (x86)Common FilesSteinbergVST2Eventide
-VST64: c:Program FilesCommon FilesSteinbergVST2Eventide
I'd also suggest doing a rescan of your plug-ins in SONAR.
Let me know if that doesn't solve your issue.
-Tom