Hard to comment without an image, easy enough to post a 100% crop so we can see your artifacts.
I'm running 6.7, have not seen any sharpening problems on GH2 or S100 raw files.
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There were “screen door” artifacts with someone else’s 5D.3 images, so it is specific to that newly supported camera.
It would be nice to see an actual RAW file, via DropBox or YouSendIt.
I rarely use sharpening above 15, even with compact camera ... don't like digital look (and artifacts) on the photo ...
The so-called "screen door effect" was caused by noise becoming distorted when applying a warp (e.g., lens profile correction). In that earlier example, a very high sharpening setting with no masking and no noise reduction was applied to a moderate ISO image.
I suggest applying Luminance noise reduction and using more Masking when applying sharpening. This avoids the pattern entirely.
Screen door effect...that kind of describes it. The only reason I flagged this was because I did not experience this while using a 40D. I have been employing the lens correction tab, so I'll take a look at this and see if it resolves the issue.
Thanks all for the input.