I install all 64bit VST2 plug-ins used in SONAR in vendor specific folders in the default path "C:\Program files\Cakewalk\VSTPlugins"
My scan path in
Preferences > Fie > VST Settngs contains the two default paths
C:\Program Files\Cakewalk\Vstplugins
C:\Program Files\Common Files\VST3
Taking Softube as an example, I install the VST2 dlls in
C:\Program Files\Cakewalk\Vstplugins\Softube
To take all the Softube VST2 plug-ins out of the scan path, I would move
C:\Program Files\Cakewalk\Vstplugins\Softube
to a location not in the scan path. Often times I use the desktop as a temporary location for folders.
It is still unclear whether the problem being reported are new plug-ins being added for the first time or the result of rescanning.