Orange boxes instead of text

Dear members,

As you can see in the photo I see orange boxes instead of some characters in the teamviewer window (at the current PC and also if I access this PC remotely). I am running Kali Linux 64bit version 2019 and I cannot say what version of Teamviewer because of this problem, but I've just downloaded it and installed it so it has to be the last one available for this operative system (based on debian).

Thanks, Regards

Marcelo