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This appears to be an example of a rare but well-known maze-pattern phenomena that occurs when the two green channels (there are twice as many green pixels as there are red and blue pixels so the green pixels are split into two distinct sets) don’t have the same amplification coming off the sensor but ACR/LR treats them as if they do, or when the compensation for how much they are off isn’t enough.
The EVOLT E330 isn’t a newly supported camera so this shouldn’t be a beta-support-not-quite-there problem, which suggests the problem has either existed for all such RAW of that model camera or your camera is has a particular issue.
This is something Eric Chan’s group usually needs to fix, unless there is a firmware update for your camera that needs to be applied that will fix the problem from the camera’s side.
If Eric doesn’t reply to this thread, I’d suggest posting something about the Olympus E-330 Maze Pattern in the ACR/LR forum(s) on feedback.photoshop.com along with a link to the actual ORF file (from your own website or on www.yousendit.com or www.dropbox.com) in addition to the example you have with this post, and see if you get someone to reply, specifically, there.
Eric did respond and has acknowledged the issue as a known one. He said they will be correcting this in the next dot release. I've also sent across some sample files. Thanks for your help and for pointing me in the right direction, much appreciated.