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[RaiMan <question698074@xxxxxxxxxxxxxxxxxxxxx>]

Question #698074 on SikuliX changed:
https://answers.launchpad.net/sikuli/+question/698074

RaiMan proposed the following answer:
So you have 
UserSystem <-> VLAB <-> VNCServerSystem

- you see the screen of the VNCServerSystem on the UserSystem (via a VNCViewer or similar)
- you use mouse and keyboard on the UserSystem to act on the VNCServerSystem (start/use SikuliX and/or applications)

--- When attempting to take a screenshot via Sikuli, the main application remains visible, but the dialog/popup is all black
This means you have the SikuliX IDE running on the VNCServerSystem and try to make a screenshot of some element you see in the viewer.

I understand: you see a popup of the application (non-black), but when
you click the capture button (or use the shortcut), the dialog area is
black in the screenshot overlay (where you cut out the shot).

I remember, that this was a problem in the past on Linux systems, that could be solved by using another GUI manager. 
But sorry: I do not remember details.

... and sorry, your environment is far beyond my knowledge and
experience.

It might help, to try with Java 11 (has many improvements targeting
screen handling).

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