Giant black spot in my Render

[Bl3ntK1tteh (K1tteh)]

So,
I’m working on this since version 2.6, and with the upgrade to 2.75 (occured again in 2.77) i have this giant black Spot in my renders
https://photos-5.dropbox.com/t/2/AACv83A9vJewxVzsWYzB3i9OItD790A_aFNTKO6XEmvOnQ/12/358301813/png/32x32/1/_/1/2/Dual%20Monitors%20v37.png/EL645ugCGIABIAcoBw/dPgtxKwABFYWCyRzrGvPs8om_DLuzwfp8YPeiox842M?size=1280x960&size_mode=3 (i can’t figure out how to get the actual image on here)
any ideas what causes this or how i can prevent it?

[Richard_Marklew]

The link gives

I assume it should be a screenshot. That is insufficient, please ALWAYS supply a valid link to a demo .blend file

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