xcode6 - Particle Emitter not acting consistently -

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i'm using same particle emitter in multiple scenes, , i'm noticing in scenes when run app on phone emitter isn't appearing when supposed to. changes different scene next time open app it's inconsistent. thought creating different emitter each scene seems pointless if 1 emitter can used across scenes. saw question related:

spritekit particle emitter not appearing in xcode editor

but no answers, wondering if else has same problem?

problem sourced z position of emitter node, set equal background can assume caused act strangely when set z position higher stopped.


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