Termbase Search not working

Hello,

I need some help with my Termbase. When I started working with Studio 2019 a couple of weeks ago, all the basic tools including the Termbase where working fine. Then I switched to another project, for which I was not using any termbase. When I got back to the initial project and re-opened my Termbase Search window, I noticed that no hits are showing, although the saved terms are still highlighted in the source text.

I have tried to reorganize my termbase in MultiTerm, but it hasn't had any effect.

I have also tried to update Multi Term to have the latest version, which seems to be the case.
I am working on Studio 2019 SR2-15.2.6.2831
Multi Term version: 15.0.6.56482


Can you give me any advice on how to fix this problem? Any simple tips? I must say that I have just started using Trados Studio and I am not exactly an IT person either...

Thank you very much in advance for your help,

Ales Burget