Odd render results

[cf53]

This isn’t important for me, just odd.

This is the base of a set of chairs in a TV studio that I’m making some stops for (previously clamps). When display is set to Render I get,

while in Raytraced and also when doing a render, I get.

[cf53]

I think I’ve answered my own question, I’ve added a blend at the point the pole enters the base.