Vortex Sound Research

Hi all, I just installed a furman pl plus dmc in my rack and it seems to be working fine with one minor annoyance. When I am looking at the blue led display I notice a very slight flickering. I was wondering if anyone else with one of these notices the same thing? If this is how they all are it is not a deal breaker, but if it is just something defective with mine I would like to send it back for a replacement while I am still within the 30 day return period. Thanks so much!