Hi Nicolas, Apple made some big changes in how multi monitors work, and the libraries that the MoI Mac version currently uses are not compatible with those changes yet.
If you change the OS setting to go back to the previous multiple monitor behavior that may avoid the problem.
The setting is under System Preferences > Mission Control - uncheck "Displays have separate Spaces" there.
You will then need to reboot your system in order for this change to take effect.
Does it behave any better after that?
The next version of MoI should not have this problem anymore.
- Michael
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