Good call. I have the Plot Legend located inside the plot area (in the upper right-hand corner). This was no issue for many PCs on which I ran my application, but it turns out to be a problem for this one particular PC. When I move the Plot Legend outside of the plot area on this troublesome PC, then the graph updates do not flicker. Strangely, the currently troublesome PC exhibited normal behavior in the past, but this piece of evidence is greatly complicated by the fact that this PC's hard drive (and hence video driver) has been swapped with another hard drive--more than once--due to extenuating circumstances. I just need to ensure the video driver is the latest and greatest. But, I consider this problem solved since I was able to repeatedly make it disappear and re-appear by moving the Plot Legend. The final solution may involve both moving the Plot Legend and/or ensuring proper video drivers. Thanks for your input!