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Vulkan Vulkan - VkWriteDescriptorSet swap image texture? Not changing?

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Hi All,
  this is probably a simple problem, but not sure why it isn't working.
I'm modifying the pImageInfo on VkWriteDescriptorSet - to a new image - but it isn't changing
// Two descriptorImageInfos, with different images/views/samplers attached to them.
// 1. UpdateDescriptorSet (i.e., set a different descriptorImageInfo)
// 2. ReBuildCommandBuffers
However, the image doesn't swap?  Not sure why, I get a `flicker' - but the original first image stays on.  Not sure why my new image doesn't show up?
// e.g., 
VkWriteDescriptorSet wd[1];
memset(wd, 0, sizeof(wd));
wd[0].dstSet           = descriptorSet;
wd[0].dstBinding       = 1;
wd[0].dstArrayElement  = 0; 
wd[0].descriptorCount  = 1;
wd[0].pImageInfo       = descriptorImageInfo; // swap this to a new descriptorImageInfo that is associated with the new image/sampler/imageview
wd[0].pBufferInfo      = NULL;
wd[0].pTexelBufferView = NULL;
vkUpdateDescriptorSets( device, 1, wd, 0, NULL );
Clear & Render()
Thanks for any help or ideas,
Edited by SimonCMax

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