Someone with Teamviewer 12?

[wonder]

Can i just clarify? -- when you still had TV11, before you upgraded to 12, none of these failures occurred [in Maui]... is that correct?

Yes, its correct, with TV11 in Maui, any problem, are when I upgrade to TV12.

Just to double or triple-check your v12 Deb file; mine is:
teamviewer_12.0.71510_i386.deb
sha512 [via GtkHash] = edc1e5823939f20a9879bd29d952a728275f5f190ad434b95e71e886086b8aca407749d5671284cec9b20007aaa4b5907c84a83cc4921f9f715738cd33c704db

Also, its correct, and always that I need reinstall TV, I go to website and download the file.

Finally (i've just re-read this thread, & don't think we've covered this already], can you pls attempt the next TV12 launch in Konsole, not with the Applications Menu launcher, & paste the output here for us all to see?

Ok, when fail again, launch TV in konsole and paste here the output.

Regards!