The cache you are referring to is your internet browser’s cache. A Google search will provide you with instructions on how to clear the cache of your specific browser.
Are you running the newest version of the vacation ghost? Which vera on which firmware are you using? Could you maybe provide more information (like ID’s and names and rooms…) from the missing devices? Then maybe I can try to reproduce this. I do have quite a few fibaro switches and dimmers and they all seem to work fine.
After installing a plugin I generally recommend clearing your browsers cache (goto settings and clear browser cache, or google) and reloading the Lua Engine (reload button on topright on your vera) on your vera a couple of times.
Did you clear your browsers cache? Any improvement?
Are the lights which you can not see in one room, or are they in a room from which you see other lights? We found an error within the drop down list (see main thread for this plugin). I think it could be related to this. Maybe you could switch a light which you don’t see at the moment to another room (just for testing) and then let me know if you see it.