Lightroom was fine, but now I cannot see the presets and some of the tools no longer have an effect on the image.
I do not see any reference to presets in any of the drop downs and have no clue what to do about some of the tools not working. I suspect it's something I've done, however companies never tell you how to fix something when it's not working. And the help menu doesn't.
Does it need to be reinstalled? What happens to the presets I cannot locate? Is there a way to save them?
Any chance you turned on the option "save presets with this catalog" (Preferences dialog) and then opened a new/different catalog?