Updated to 4.2
Now the options in ATC show, but are greyed .. ?

What am I doing wrong.

Using FSUIPC and FSTramp addon, when disabled, still same problem.
I see in the update specs 'The ATC window now longer processes key commands when key modifiers (Shift, Ctrl, Alt) are held down'
but I do nothing of that kind, the numbers and selections are simply greyed and nothing happens when either tapping the numbers, or mouse clicking the line

?

[SOLVED - need SDK repaired]

never mind
had accidentally restored drive from old backup

missed SDK

FYI:
for ATC you need SDK installed

 

I also had this problem. Finally uninstalled 4.2 client and reinstalled it and now the atc is working, at least for the moment.

You do not need the SDK to run P3D any version.

 

Jorge