I also did a check with all three sites to see what happened when I reduced the width of the browser window (Firefox 31.0 again)

The other two behaved well - they seem to have a minimum width set for the content, and when the browser window width drops below this the browser gives you a horizontal scroll bar.

So it looks like Renderosity forgot to do this. (Maybe I should have posted this one to the 'bugs' thread? Edit: posted near the bottom of page 7 of the bugs thread)

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).