Hey host83-
The major Update 3 issues were fixed in 4.12.4 with a QFE available for 4.11 (Current Available Quick-Fix Solutions - Announcements - Epic Developer Community Forums) . If you are running into issues using Update 3 / extensibility tools / UE4.15 (or any engine version after 4.12.4) then please create a new post with as much information about your issue to help us investigate the problem.