Hello ,
Just to make sure I am clear on what you have tried. You have tried making the changes suggested on the page you linked above and this did not work for you?
As for the project having issues on launch. Could you try deleting your saved and intermediate folders before upgrading your project and let me know if this makes a difference?
Please see answer at: https://udn.unrealengine.com/questions/296677/movie-playback-broken-in-412411.html#answer-297096
Let’s close this issue as it will be fixed by Max in 4.12.2.
I opened a new one for 4.12 crashing: https://answers.unrealengine.com/questions/432006/hierarchical-instanced-static-mesh-component-crash.html
I am happy that the issue was has been reported. I see that the tracking number will be UE-31702. I will be converting your last comment to an answer. Thank you for your time and information.
Make it a great day
I use UE 4.13. The problem persists