It's not just you, this is a known issue. We made some improvements in recent versions, but unfortunately we don't have a proper way to completely fix this yet. Here are two possible workarounds.
Either: Render an image that's a couple of pixels wider, then crop it down to size in Photoshop. This might create a small jump at the seam, or it might work just fine, so it's worth trying.
Or: Rotate the camera 180 degrees in the Y axis, then render a small crop in the middle of the image (where the seam was in the first render). Then you can use this to patch up the area in Photoshop.
Matt