I have a good example why i think this is a new bug if you have the camera selected when you are running the sim you can see a tiny version of the sim running in the camera as it was working in 4.12.5. It just wont let you keep the camera connected to the large view port in 4.14.1.
I double checked also if it had something to do with the camera being set to locked in the cinematic but it no luck it didn’t fix it.
Thank you for the help in looking into this I been waiting since I switched over 4.14.1 and it causing me to rethink my plans.