Ctrl+Enter function just stopped working

Hi,
so I am in the middle of a project (newbee on Studio 2019, my first CAT) when suddenly the Ctrl+Enter (move to next segment) function stopped working. I did nothing to prompt this, as far as I can tell; it just happened.
Automated Translation (DeepL plugin) has also stopped providing a suggested translation, even if I mouse-click the next field, although it is still activated for this project. If I enter a translation manually, there is no little "AT" symbol in the middle column.
This just happened out of the blue, after having worked without problems for a couple of hours. I restarted my computer, but to no avail.
Has anybody come across this? 
I can only find references to Studio 2015 in the forum database for this problem, so thought re-asking this question would be better.
Thanks in advance,
Margaret

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  • Right, so it just happened AGAIN. Yes, I downloaded and installed the update yesterday.
    Again I have copied the remainder of my document (still the same -- very long -- one) into a new file, started a new project, and am now able to proceed normally.
    So can you please tell me what I am doing to make this happen? It's like Studio freezes for a moment, then all the untranslated segments change from the "white sheet of paper" symbol in the middle column to the "confirmed translation" symbol (see above), ctrl+enter stops working, and translation suggestions no longer appear when an untranslated cell is activated.
    This is awfully frustrating.
    Thanks in advance,
    Margaret
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