Hey Cultrarius -
This sounds like an issue of bounds needing to be adjusted. With the Particle Effect attached to the player your bounds need to be large enough to still register in the Player’s Camera view. If no bounds are set at all, then you have a point centered on the root of your character which is never seen in the camera so not rendered. Try simple setting fixed bounds though you may have to go into the details panel for your emitter and make it slightly larger.
Thank You
Eric Ketchum