Paste using enter key no longer available

Hi and thanks for the suggestion, but right now the 2 machines I have in front of me are both operating again with normal <enter> key will paste, and that option is set to "move down"

I tried a variety of key combinations like Alt + Ctrl and Enter, as read someone had success, and 2 out of 5 machines resumed operation, although I could not figure out which combo made it work or if it was due to an interim update via the Office 365 live updates. A wIn7 machine was still not operating last time I tried, about 6 weeks ago, but don't use that PC often, so had given up trying to fix it ...

It is a strange behaviour to suddenly lose and randomly regain, with little chatter online about replication/removal other than a few specific issues, that are either patched or in version long since left behind ... but highly irritating after 30years to suddenly not be able to use one of the features/key combinations that is used most (by me)!!

Would love to know if there is a key combo to toggle it, that I can use if it happens again, but I do think it was relating to updates, as the issue appeared on multiple machines at roughly the same time, and cleared at a similar time ... probably will never know!

Thanks

Richard