- macOS 10.14
Steps causing the bug to occur:
- Run composition from this thread: https://vuo.org/node/2424
- Exit fullscreen
- Click up and down buttons multiple times.
- Output window keeps Minimising/Maximising randomly and unexpectedly.
- Same thing for me on two OS's and two different MBP's, 2012 OS 10.12 (GT650) and 2015 OS10.14 (Intel Iris Pro 1536 MB).
I have not got any 'special window manager installed'.