Chill – this is a user-to-user forum (with some really knowledgable users – not me though!)
It would probably help if you mentioned your OS and whether you'd trashed your preferences recently.
Thank you but no I have not changed ANY preferences since I set them at the initial install in 2014.
Installed on Win 8.1x64.
I'd be happy to chill if I could find some way to actually CONTACT Adobe regarding this. I find it quite ironic that their "support chat 24/7" is "currently closed". So I have no other venue available to me at the moment. If you know of a way to get in touch with someone at Adobe I'd be thrilled to learn it. I know sometimes there are back doors to support or "not-so-well-known" support contacts.
Read the link I gave you and try trashing your preferences – it's a way of removing application corruption that happens occasionally.