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Yes, the tests I'd been doing now were directly on my OSX machine no VM.

So, I've just tried this again running on a linux server running AWS AMI Linux (RHEL based) and it works fine, both your test code and my original application. So this is less of an issue for me personally now, although it will make dev a bit harder.

I'll post this as an issue as the code looks to be fine as it only seems to occur on OSX. It is definitely running on the GPU when I run on OSX as it is far far faster than using a Mat it just produces these strange results.

Apologies for not testing it on a different setup first, I'm relatively new to OpenCV so I just assumed it was me doing something wrong! Also everything else I've done has also been fine on OSX until now.

Thanks for your help.