...you are not supposed to see those yet. They are the targeting reticle for the new Orbital Laser Strike rune.
Not getting those, but I'd actually appreciate if the real grid lines would be more subtle like these rather than solid black lines. Like this grid I once suggested for Wesnoth (and which made it in): http://forums.wesnoth.org/viewtopic.php?p=207145
All photos are automatically resized, it's a built in feature of the forum, so unless they are really big in the y axis, usually isn't too big of a problem. The Signatures I don't know enough and haven't used the Xenforo forums enough to know if there is a way to force signature sizes to a certain size, it might be able to force individual images, but yeah. And I haven't seen those. But maybe I haven't been paying attention.
Ok in that case did u try changing resolution? looks like it's something like an overlap with buggy fitting on the screen. Maybe should update graphic drivers too (or u have buggy beta drivers). Last i can think of is click repair installation on launch screen, could be a badly downloaded file.