Try disabling Lookahead. The problem is probably caused because Studio looks ahead a couple of segments when you are in the first one and caches the results to speed up lookup. Then when you actually go into the next segment you get the cached result and not the one that may be better based on the previous segment. You can either arrow down to the next segment and then go back up which will probably trigger the latest TM lookup, or disable Lookahead.
It's a useful feature when using MT as you don't have to wait for the lookup on an external server, but can be a drawback when just working with your own TMs.
Paul Filkin | RWSGroup
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