Unlike e.g.LoadFromHexString, MemoryBlock::copyFrom does not ensure the size of the MemoryBlock before doing a memcpy.
If there’s a good reason why it doesn’t can the doc at least make that really clear and jassert?
Thanks 
If you want a full copy, you can simply use the = operator.
The docs do make it clear that this case is handled:
https://docs.juce.com/master/classMemoryBlock.html#a31d3f1d7a0269229c5f0c36ab0b9dc40
numBytes how much to copy in (if this goes beyond the size of the memory block, it will be clipped so not to do anything nasty)
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Ahh, so it does, Thanks.
Home schooling and reading docs properly is not quite going as well as I thought 
Obviously the kids need to be reading the docs!
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