In the side panel, the system resource summary is hiding the first pixel line of the planetpanelcontainer.
The attached patch move it two pix higher, to properly display the hidden line, and with an empty line to let the background appear.
See the attached screencaptures for before / after * with / without rendered planet
Looks fine to me without the patch. I suggest posting about this on the forums...
Follow up here : http://www.freeorion.org/forum/viewtopic.php?f=9&t=8924
Design issue... discuss on forums.