Drifterlee, Might I ask what your render settings are for Lorelei? 
The reason I ask this is I was working on a pic with her, and did a test render - wth the Automatic Render Settings slider at the default level (two 'ticks' above draft - and saw visible seams.  
I checked everything else was allright, set the slider to 'Final' and re-rendered.  
No Seams.

So, having seen seams appear at low quality renders might be a problem, and changing your render settings might make the difference.