What version of OS X are you using and also what's the model of your computer. Cause if you have an old model or if your using an old version of OS X things probably won't work well.
This bug first appeared when I upgraded to 14w10c but after switching in between versions a few time the bug stop appearing. Right now I'm not sure why.
What version of OS X are you using and also what's the model of your computer. Cause if you have an old model or if your using an old version of OS X things probably won't work well.