So I made a game for Windows and I wanted to make an OS X version too, but I'm getting weird things going on with the mouse input when I test on Mac.
Each frame I set the mouse position to the middle of the screen and then next frame I check the mouse offset and use it as the input for moving the crosshair. This works fine on Windows but on Mac there seems to be some problem with setting the mouse position, mouse movements are getting amplified and the crosshair gets 'stuck' at the top of the screen.
Here's a download if you want to test, and if you want to dive into the code the mouse stuff is under player.lua.
Has anyone run into similar issues with love.mouse.setPosition() on OS X? I should also note that I've only tested a packaged .app rather than a .love.
That seems to be caused by a Mac-specific bug in the version of SDL (the library LÖVE uses for cross-platform windowing/input) that LÖVE 0.9.1 ships with. The bug has been fixed since then and the next version of LÖVE (0.9.2) will use the fixed version.
In the meantime I might upload a new build of LÖVE 0.9.1 for Mac containing the updated version of SDL, though.
Artificial Immunity.love