TERM RECOGNITION IS NOT WORKING IN SDL TRADOS 2017 SR1, BUT TERMBASE VIEWER AND TERMS ARE FINE

Hello Paul,

Term recognitin is not working in SDL Trados 2017 SR1 (freelance), but terms are fine in Multiterm Termbase and in Termbaseviewer.

Configuration: Windows 7 SP1, SDL Trados 2017 SR1 (freelance) and SDL Multiterm 2017 have the latest updates installed.

Term recognition is not working and Terms ARE NOT lined red in the source.

If i try to add the same term again using 'add new term or quick add new term', Trados says "this term is already present in the termbase. Do you want to edit an existing entry?"

I have done:
(1) Resetting window layout
(2) Deleting and renaming settings file/respective folders of SDL Trados and Multiterm
(3) Tested different termbases
(4) Reorganising the termbase and even checked the language variants
(5) Used Excel glossary plugin too

I have almost tried ALL solutions provided in this website and other sites too.

Languages: Tamil (One of Indian languages) to English (United States) translation
When Tamil is a source language, the term recognition DOES NOT work.

When English is a source language, the term recognition WORKS without any problem.

Please provide a suitable resolution for this issue.

Thank you in advance Mr. Paul.

Regards,
Govindarajan.P.S.,
French and Tamil translator,
India.