Simona Golebiewski We will be pleased to help you with this problem so have logged a support case on your behalf. You will be contacted at the email address used for this Community. Support Case Id : 00660642 .

Thanks kindly for your help, the above problem has been solved.
I still have a problem with the following message:
You have set up different translation memories or automated translation providers for certain language pairs
Is not activated the option: Using Different Translation Provider and still the above message appears

Trados doesn't recognize segments already translated, I have a standard document that I have translated dozens of times, and it doesn't recognize the segments.
Again, I have read and applied everything I found in the community

Have you configured your translation memories both in All language pairs and in a specific language pair? This is the most common mistake leading to such error message. You may configure TMs only in All language pairs OR in a specific language pair, but NEVER in both. Please check that in your Project settings (NOT: File -> Options!)*.

* Should you have that also configured via File -> Options change the settings there too, as these will be applied for any new single document translated without creating a project or for any project based on your default project template.

Have you configured your translation memories both in All language pairs and in a specific language pair? This is the most common mistake leading to such error message. You may configure TMs only in All language pairs OR in a specific language pair, but NEVER in both. Please check that in your Project settings (NOT: File -> Options!)*.

* Should you have that also configured via File -> Options change the settings there too, as these will be applied for any new single document translated without creating a project or for any project based on your default project template.

Thanks for the reply
I didn't understand how I can configure only in a specific language pair.
Which option should I disable in File -> Options
I tried and failed

I removed this option from All language pairs
and now when I open a new document for translation I get the message > No open translation memory or automated translation servers although the memory is open :( 

Hello, again

I checked the language pair in project settings and I have the language pair English Romanian instead of Polish Romanian. I cannot change the language pair, the option is not active.
Can someone help me? Please
When I open a new document, I don't have the option to choose the language pair, but the document is loaded directly into trados. And the memory is not open, obviously it is a memory for Polish Romanian not English Romanian.

Please post a screenshot or describe detailed how do you open a document in Studio.

File --> Translate single document or drag and drop file

in Project settings the language pairs must be Polish Romanian not English Romanian. 

What is the file name extension of the file you are trying to open? If you do not see the file name extension, go to Windows Explorer, select the View menu and click  the checkbox "Show file name extensions". Then tell me exactly what the file name extension is.

Upload in Trados, as usual pdf or word documents
I can't explain these errors, without having changed some options myself

For PDF or Word Studio will certainly show a language dialog, as the automatic language pair recognition is not possible there. For me it looks like would you either be opening a sdlxliff file (or a xlf file) or just going to the Files view in Studio and opening a file from there.

You can set up Studio to suggest you a most used language pair. To do so, go to File -> Options -> Editor -> Languages and chose the language pair you use the most.

And again, please give me the exact file name extension of the file you are opening and not seeing the languages dialog.

I have set the language pair Polish-Romanian exactly as File -> Options -> Editor -> Languages and it works now.
Although, it still left the message : You have configured different translation memories or machine translation providers for certain language pairs

The uploaded file has the pdf extension, as shown in the screenshot

I can work now, although I have that message :)

Wielkie dzięki za pomoc i cierpliwość!

Looks better now. However, when you already started your translation, you do not need to open the source file again. Just go to projects view, select the project containing the file you started to translate and open this file from the files view WITHIN Studio.

As for the different translation memories: are you using Studio 2021 in the most recent version with all updates?