Comment 6 for bug 1704237

Since I cannot test on Linux real machines and even not with more than one monitor, I wanted to be sure about the screen setup as Java sees it.

Now I agree with your idea about the wind manager.

There is another bug that goes into a similar direction:
https://bugs.launchpad.net/sikuli/+bug/1704302

What you now can test is, whether the problem is only with the "interactive capture" or with the screenshot feature (based on Java Robot - see other bug) as such:

print capture(Screen(0))
print capture(Screen(1))

and inspect the images, that are stored somewhere in temp