Screen Sharing from Somona to High Sierra: alt key and mouse trouble

Thanks for testing.

Alt + clickdrag (copy) works nicely in Finder still even for me, but not in the mentioned application.

I tried switching alt and Ctrl modifiers places but that doesn't work (defult can not be changed) when no actual keyboard is connected.

So it's like keyboard and mouse commands enters applications from the system another way than the standard way when using remote screen sharing. At least on old applications like this one. Maybe this is hardcoded into the application somehow, then there's no solution I guess.

Now I have also tested Screen Sharing to an even older Mac Mini running 10.6.8.

On that system Screen Sharing with the mentioned application (same version) works, click drag and alt click drag.

I wonder where the problem lies when using High Sierra then.

Seems unlikely that it has to do with virus or VPN but no, I don't have any of those.

Thanks for the interest, I don't post that kind of information online unfortunately. Guess I'll have to stand my ground for not getting it solved.

Yes, I read that all the times but it's impossible to know without being an expert and inspecting the complete log myself so...