How to remove the black stuff on characters like paragon?

[ClockworkOcean]

Take a look at this

Lingering shadows that stick to the ground after movement - how to resolve?

[1] Whenever I have a niagra effect finish, it leaves a shadow behind like its burnt into the world. Refer to animated gif, you can see the shadow remain after the firing animation completes. This burnt in shadow lasts until I zoom in, after which the artifact corrects itself and goes away until I shoot again. How does one correct this graphical issue with niagra fx? (or if its not just pertaining to niagra, in general?) EDIT: This is not a niagara issue, this is a virtual shadow map issue…