Pavel Tsvetkov 

Does your standard termbase match exactly the language settings in project?

Jerzy,

Yes. It is not a new termbase and it has worked flawlessly in mulitple projects for the same client.

So if that happened all of sudden, check the changes in your product. I use the same version of Studio and am able to add terms with no hassle.

Did you install any add-ins recently? Maybe you installed RAT? Or there is a shortcut conflict (happens when RAT is installed, as the natiove CTRL+SHIFT+F2 stops working due to being double assigned).

Otherwise I would go the usual way (obviously one by one, followed by Studio restart):

• remove the TB from the projects settings, close Studio, reorganise TB, restart Studio and add TB again
• reset window layout
• reset user profile
• load user profile from backup
• load a completely fresh user profile
• as last resort: gateway.sdl.com and articöle 1414

• remove the TB from the projects settings, close Studio, reorganise TB, restart Studio and add TB again – tried it but did not work
• reset window layout – tried it but did not work
• reset user profile – tried it but did not work
• load user profile from backup – not sure how to do that but if resetting did not work...
• load a completely fresh user profile – not sure how to do that but if resetting did not work...
• as last resort: gateway.sdl.com and articöle 1414 – cannot locate this one

I must point out that I recently had problems with adding any termbase to Trados as explained here. I was finally conacted by Trados Support who took a long time fixing the problem but did succeed at last. However, this new problem must have occurred at the same time, or else, a pre-existing problem must have been left unfixed.

Pavel Tsvetkov 

Fresh user profiles are here: C:\Program Files (x86)\Trados\Trados Studio\Studio18\UserProfiles
Resetting does not really mean the profile is "clean".

It is very advisable to create a backup copy of your customized user profile and store it in a place outside of Studio's reach.

The mentioned article is here: https://gateway.sdl.com/apex/communityknowledge?articleName=000001414
Unfortunately, someone there had the idea to have Google search active instead of product filter (second position) and since then no one is able to find articles by number, if  this person does not change the search setting.