Somewhere after I upgraded to OS 10.5.6 or 10.5.7 I get a "dip" to blue in between screen refreshes or when a new window opens. It happens when working in most programs, notably Final Cut Studio apps but others too I think. It's not a "blue screen of death" but a light blue full screen that appears, then fades out, then the proper application screen comes up. It's a bit annoying but not a deal breaker. Is there a way to not have this happen?