Translation Results no longer appear automatically

I have just upgraded to Trados Studio 2014 Version 11.2.4435.12. 

However, the alternative translations for a segment no longer appear automatically in the Translation Results window.

I can get them to appear manually by clicking on "Project Settings" then immediately clicking on "OK", on a segment by segment basis.

How can I get them to appear automatically, just as in the previous version?

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