I wrote a series at http://www.rockhoppertech.com/blog/auv3-midi/ a few years ago. I should update it, but most of it is still valid.

I spent some time on this a few years ago, so I can confirm. In my auv3 tutorial code I added checks to see if the cached blocks that should have been initialized in allocateRenderResources were nil or not. It worked but it has the feeling of fixing an airplane wing with bubble gum.