I’m glad to hear that it isn’t happening in the Preview. I would never suggest to actively develop in a preview version of the engine as the architecture is always changing and it is much less stable than release builds. If possible, I would suggest sticking with 4.10.4 until 4.11’s official release. If you do need to upgrade however, be sure to keep your copies of your build from 4.10 instead of converting them directly, just in case anything goes wrong.