I don't know if I have a graphic card. They first started to appear when I was coming back from afk'ing when I pressed 'Tab' and 'Alt' so I could switch from Google Chrome to MapleRoyals, next thing I know when I click on my character the boxes started to appear. Then after that, they started to appear at random time at random events. I don't think my laptop was hot when they came, but then again, my laptop is hot most of the time due to it's always being on and not shut off.
There are a few different things that could cause this issue. If your system is running too hot, then that can be one cause of it.
