Hidden map area briefly revealed when browser window is resized

Hidden map area briefly revealed when browser window is resized One of my players in my campaign today admitted he had a brief glimpse of the hidden map, by accident - I have replicated it, I set the map to 100% -logged back in as a player and then re-sized the whole browser window (via mouse on bottom left corner of window) and the hidden map flashes in and out of view. my browser and his is Chrome. ( My Chrome browser is ver 21.0.1180.83 m)

I was able to replicate this in Firefox 15.0. It's an incredibly brief glimpse, and you have to basically know what part of the map you're looking to show and repeatedly resize to try and get a useful glimpse, but it is doable.