OS X Preparation: Disable App Nap
OS X 10.9 “Mavericks” and 10.10 “Yosemite” have an App Nap feature that reduces energy consumption by putting applications that are temporarily unused or in the background into a Nap state. This Nap state can cause windows in CueStation 5.5.1 and 5.5.2 to flash red, blue, or magenta.
It is recommended that App Nap be disabled for CueStation 5.5.1 and 5.5.2. The following procedure is not necessary for other versions, as this behavior is not present in CueStation 5.5.3 and above.
Make sure CueStation is closed.
From the OS X desktop, choose Go > Applications to open the Applications folder.
Right-click the CueStation application icon and choose Get Info.
Get Info on CueStation Application
In the Information window, enable Prevent App Nap.
Prevent App Nap Enabled
Close the Information window.