You should know if you are running 64bit SONAR, I can only guess by the description of the Focusrite plug-in behavior. If you are running 64bit SONAR, the standard 64bit installation only adds the 64bit version of TH2 SONAR or Producer (depending on which version of SONAR installed). 32bit VST plug-ins will have
(32-bit) appended to their plug-in name in the VST lists. Also 32bit VST plug-ins are show in green in the browser.
In order for 32bit VST plug-ins to work in a 64bit host, they must run inside another program which acts as a bridge between the 32bit and 64bit environments. This results in the plug-ins actually running outside of SONAR. BitBridge, a program bundled with SONAR, is a server which hosts 32bit VST plug-ins. This is why they show up as separate Windows processes, wrapped with a different header and lack X-Ray.
It is possible to display the standard VST header for 32bit plug-ins by hold the SHIFT key when opening the plug-in UI. This will cause the standard VST header to open in second window usually behind the plug-in UI. This header contains the "Give all Keystrokes to plug-in" option along with the other VST header features. The header window is also dockable where the plug-in UI is not.