I originally made a lava particle effect in 4.9 and didn’t try it out again until 4.13 when I found it acted completely different upon collision.
4.9
4.13
[Particle effect and material to try in 4.9 and 4.13][1]
This is a migrated asset. I didn’t change any of the parameters and used the same material. I tried it in new blank projects for both 4.9 and 4.13 with the same results. So… what changed, and can we still get the same effect with the most recent version of the engine?
I am also having this issue. Particle effects with collision behave wierdly and very much different from 4.11 that I used before switching to 4.13… The particles seems to get destroyed instead of bouncing even though they are set to “bounce” in collision settings.
This looks serious. You should re-post this in the bug reports category, as you will be more likely to get a response that way. I really hope this get fixed!
After a lot of tweaking around in an attempt to debug the wierd behaviour I was experiencing, these where some variables which needed to be changed from how they where used in UE 4.11:
First I needed to change this value::
And I also unticked the drag, since this also behaved different from before, seemed to work alot better without it (for my purpuses):
after that, previewing the particle effects system on some basic cubes resultet in the correct behaviour, but when applied to my scene it STILL gave the same wierd behaviour. After a lot of figuring out, it turned out that the static mesh material in the scene that was hit by the particles was UNLIT, which now caused the particle effects to freak out when colliding. After changing the material to Default Lit, everything worked out as expected.
Best Regards, and Have a mad day!
Glad you found a solution! Thanks for sharing. 
