This is a known issue we are seeing (action targets not showing up) only on some machines with v18. This only affects certain machines so we are trying to determine what the unique circumstances are.
If you are experiencing these problems and are running Lectora Inspire v18 then please uninstall Camtasia and SnagIt so we can further rule out those product installs (please post any results here). Note: you can run the install again (over-install) to put these products back.
We are actively looking into this issue and hope to have a swift resolution.