Finding the current screen resolution would be the only tricky part of this.

Okay, since I know nothing about Mono, I won't ask why. Instead, I suggest adding at least 22px to the y-coordinate, which clears the menu bar on OS X.

Yes, that would be an even simpler change.

I believe this was fixed by #2165; the AskForAutoUpdates popup appears when launching for the first time, and that PR moved it to the center of the screen.

Hi! I keep running into this problem, even with current versions of CKAN. #2165 is only about the AskForAutoUpdates popup, not about the Main window placement.

Yeah, I misunderstood this issue. Oops.

Well that's interesting. Default location is 0,0.

And (0, 0) is exactly where the window opens on first run. On macOS, this neatly tucks the window's title bar (which is 22px in height) behind the menu bar (which is also 22px high). So on macOS, any y-value of ≥23px is a sane default.

Possible workaround not requiring third party tools:

Edit Kerbal Space Program/CKAN/GUIConfig.xml and change this:

  <WindowLoc>
    <X>0</X>
    <Y>0</Y>
  </WindowLoc>

to something like this:

  <WindowLoc>
    <X>0</X>
    <Y>50</Y>
  </WindowLoc>

Edit Kerbal Space Program/CKAN/GUIConfig.xml
[...]

Yep, that seems to do the trick. Thanks!