This has been happening to me for awhile but I could never get a screenshot until now. When I play on my laptop, I get this box on my lower left hand screen that blinks on and off. It seems to react to the position of my pirate at times. The screen is usually like the clouds you used to see if you glitched through one of the tavern walls. (best way to explain it) But when I downloaded the test server it got even worse! The size of the box doubled so now it covers the chat interface AND my weapon skills. It flashes on and off quickly. The flickering box on test is now like a mini reflection under the island i'm on. Does anyone know what's going on? Or how to fix it? It's been happening for awhile now. I'm on a Mac Book Pro and I'm directly hooked up to the internet (no wireless), in case that helps any.
Here is a picture of what it looks like when I'm on test.. Now imagine that going on and off, flickering: