Hi! I know it’s a bit late but I think I found a sollution.
I had a similar problem where the engine crashed when I open a level sequencer.
This happened ever since I updated from 5.4 to 5.5(I installed 5.5 at a different drive).
I deleted the DefaultEngine.ini at the Config folder of my project and let the engine recreate a new one.
After that, the engine no longer crashed.
For sure there’s a way to solve this without deleting the ini file, so if anyone finds a better way, please let me know.
Update: Instead of deleting the entire ini file, I opened it on the notepad and just deleted the lines containing ‘bluenoise’.
That seems to solve the issue too.