Can you post a picture of how your setting the motion blur post process from value x back to 0?
Also is your post processes volume set to “unbound” in the details panel so it affects the entire world?
Lastly you can try calling an event that overrides it back to 0 I posted an example in a thread here yesterday of how to do that [https://answers.unrealengine.com/questions/297166/how-to-make-an-underwater-level.html][1]
[http://i.imgur.com/PNNuEnN.png][2]
Don’t forget to accept an answer that best clears your question up or answers it so when the community finds your question in the future via search/google they know exactly what you did to fix it/get it going as well as keeping answerhub clean so that it gets removed from the “unanswered questions” catagory.