Hi, we had exactly this same behaviour on our VNXe, not sure if it was after an update or just not noticed it.. anyway, after a week of waiting we got a response from EMC support and it resolved our issue. Posting it here for you in the hope it will for you too.  Go to the CIFS Storage, Storage, Folders, Shared Folder Detail.  Expand out the Advanced Options, put a tick in "Notify on Write" and "Notify on Access"  Click apply.  Test it.  Worked for us, clearly you try this fix at your own risk etc etc.  I would also be interested to hear from anyone and their experiences with support for this new device.
So when you have a folder open and open a file. Do Save As, and pick a new file name and hit save, you must hit F5 to actually see the file. I have been told this is related to SMB 2, but am curious to know others thoughts on this and what solutions others have found. It doesnt seeem to matter what type of file. Newly created files also need to have hte folder refreshed before we are able to see them. Usually its instant, but what I am finding now is that there is sometimes a delay and users dont see the file for 20-30-40 or more minutes with multiple refresh, while others can see it right away.
VNXe CIFS shares do not auto refresh