I imagine graphic bugs are pretty common seeing as the mod's in alpha, but I'm wondering if they happen to everyone at the same places. I've encountered two so far, the first was well inland when I came across what I guess is a radio tower painted with red and white stripes (looks basically like a lighthouse), I saw it from a distance so ran towards it but when I got really close if I looked towards it a tonne of triangles appear making it impossible to continue. The second was nearer the coast where I spotted a military looking hanger, if I'm close enough when I look towards it I get the same weird triangles.
It's a shame that both are very juicy looking places to investigate :/
EDIT: Just read this post and it seems that others are having the same problem especially around military locations (which I think both of mine were) - http://dayzmod.com/forum/index.php?/topic/50108-graphic-glitch-the-fractal-nuke/