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Studio 2019 TM strange (faulty) behavior

Hi

It seems that Studio 2019 in not doing a proper job of updating main translation memories and in populating the translation file through pre-translation and thereafter. My current example is this:

I received a PDF file for translation (not scanned, but "open"), I converted it to plain text and opened a project for it. Subsequently, the client sent me a word file of the same PDF file with minor conversion variations from my file. I started a second project with the client (second) file, worked on it for a while, but then decided to go back to my original conversion project. I updated the main translation memories in the second project, and pre-translated the first project again. To may astonishment, not all segments were transferred to the first file, even if they were identical. Moreover, certain identical segments were not even subsequently identified as a partial match. Identical segments between the two files seem to have simply vanished and not recorded in the TM.

This behavior was identified previously about two years ago, but also since.

Can this be explained / repaired? this is very bad for translation productivity to say the least.

Best

Shmuel