surprise to see this, I have shot quite a lot of pictures with GR, never experience such incident. Does anyone any similar problem ?
I use the GXR M module for so long, and I hardly see it. Moire yes, but until it's rainbow colors - nope.
In playback mode, you can edit your JPEGs using the "COLOR MOIRE CORRECTION" to "off, weak, ..., strong". Maybe Kevinty can try this out and see if there's any difference?