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TM suddenly not being recognised anymore

I’ve been having the following problem:

I’ve been working on several batches of the same project for a client. When I unpacked the latest package today, Trados unpacked it as usually into the project folder. When I open the files and try to work in them, text which is very similar to the previous batches is not being recognised, and even a Concordance Search says “no matches found”. The TM attached to the latest batch is the same one as with previous batches, the TM is showing in Project Settings as enabled, and it is also showing at the top of the Translations Results window. Strangely enough, when I open files from previous batches now, the TM recognition and concordance search doesn’t work anymore either. I’m wondering if I have inadvertently changed some setting somewhere but don’t know where else to look for a solution except under Project Settings. Can you help?

Many thanks in advance,

Gerti