I have found there are a lot of materials that are broken in v14 when used as bump. Such materials as combiners are not working. They will look fine in preview but will not render in final. The only materials I am finding that will render bump in final render are darktree and enhance AM materials.
Just wanted to give anyone a heads up on this incase you are finding your models looking wrong in your testing of v14.
A report has been filed.