Studio crashes when trying to open a file in the Editor

Hello everyone, 

I am a restarting a thread because the last one about this problem didn't get to any solution, and pretty much the same happens to me.

So, to recap, I am trying to translate a big file (43000 words, about 70 pgs), which is in PDF format, with lots of formatting. In the first place, I tryied opening it directly as a stand alone file, I could go through the process without problem, analyse it also, but when trying to open it in the Editor, Studio crashed. I tryied again and realized a Word file had been created in the same folder (mysterious to me...), so I tryied with this one. The same happened. 

Nothing happens, Studio just closes with no message.

I use Studio 2019.

And also, I have been working with no problem whatsoever in a big document for the last weeks, and I'm still able to open the files of this project.

Any clues?

Thank you!