Xmaster doesn't like too start in the background
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If you open Xmaster, and switch to another app while it's starting, once it's running it takes over the whole screen, but doesn't receive the mouse & keyboard events, because it's running in the background. You have to blindly switch into it (for example by opening a terminal and typing 'open -a Xmaster').
There are two possible solutions:
1. switch to Xmaster as soon as it's running
2. check if we are in the background and disable the display when necessary
The original Xmaster used to switch back to Aqua immediately to prevent this. This caused the screen to flash annoyingly as X drew the desktop once.