Plug-ins visible and active in 'Plug-in Manager' but cannot be used
I am able to view my Plug-ins via the 'Plug-in Manager' but cannot select them for use via the 'Audio Units' drop-down menu. I have followed all of the steps provided in the link below, rebooted my machine several times and attempted a re-install of Logic Pro X, all to no avail. The plug-ins show as having been 'successfully validated' but cannot be selected upon leaving the plug-in manager menu..
Link to steps: http://help.timespace.com/home/logic-pro-not-seeing-audio-unit-plugins
Thanks in advance!
Logic Pro X, macOS High Sierra (10.13.4)