My bet is you're using a Mac and the Cmd key is being hijacked by the OS or another program, and I suspect if you reboot they'll work again for a time, until you launch the program that's taking them over.
Thank you Peter. I am using CC5 and Yosemite operating system.
I believe you may be right. I relaunched my computer, opened InDesign and all went well until I needed to use Photoshop, then this problem occurred.
Would you know how to how I can get back so I can keep several applications open without this problem occurring?
I suspect it's actually your browser, but I'm not really a Mac guy at this point and don't keep up with all the latest nuances. Maybe Steve, who's handled a lot of similar questions, will pick up for us.
Hopefully Steve will come back to me with a solution as it is proving to be a little annoying as you can imagine.
I appreciate you help Peter, thank you.
I've never heard of Photoshop grabbing keystrokes from InDesign on a Mac so I think it's something else.
I'd first look through your Mac OS keyboard shortcuts: System Preferences > Keyboard > Shortcuts. All three shortcuts you mentioned use both Cmd + Option. See if you see system shortcuts that use that combination.
Do you have any browser extensions installed? Or startup applications (go to System Preferences > Users & Groups > Login Items) that might be called out with keystrokes?
Thank you for your help Steve.
I have gone through the shortcuts preferences yet again this time and I noticed a couple of warning signs, so I bravely reset the default and the signs vanished.
Result? So far so good.
I just don't understand why this happened mid-way through a project as it's never happened before, but.... that's the past and we move forward
So thank you once again for your advice Steve.