Guys, I also just registered to post here, but in my case I might have the solution for you. At least it worked for me
Damn, this game is so weird... I tried the same trick to get rid of another bug Im experiencing (object text not readable - text glitch), which is turning full-screen off and on.
It didnt work, but I tried disabling full-screen, than clicked somewhere on my desktop, and re-enabled full-screen. Tadaa, the black mouse cursor from the OS disappears.
I hope it works for you too, Im using a Mac 15inch newest OS X, nvidia gt 650m, intel 7.