Delayed Audio in 4.15?

This is on windows, brand new SSD, i7, 16GB, through Play in Editor.
Listening to the songs in the content browser work fine though they’re delayed when played in game.

Tried it on the artist’s computer, his all work perfectly fine (same project, same code as mine), so I guess I am the only one with the problem.
This is a pain because I’m trying to update the game’s audio system to allow for intros->loops, with crossfades, etc. But everything has a large delay on it.

I’ve attached a recorded clip, halfway through I walk into a trigger volume that stops the current song and plays the new song, and you can see the delay I’m dealing with. (Works fine on the artist’s computer however).

Any ideas on things I can try? Clearing some sort of unreal cache? Some other tests?

Thanks!

P.s. This is on a clean install of unreal on a new SSD from monday, though it also happened before then.

Edit: Since this is apparently not a very common problem, should I post it in the answers/bugs section?
It’s directly impeding my work so I can’t just leave it unfixed. Thanks.

Edit 2: I created a sound cue with a mixer where a 2 second song and a 200 second song play at the exact same time. Results in PIE were as expected, smaller song plays immediately, with the bigger playing 2- seconds after.