Particles jump around in Ram Preview


hi, i'm using particle world create sort of spinning star galaxy effect.  reason, after working while, i've started getting issue particles sort of jump around.  here's link video don't have try describe it.  http://www.youtube.com/watch?v=bselsq-gm1m&feature=youtu.be .

 

toward end of video, can see me scrubbing through timeline, , can see it's not screen refresh issue.  particles moving different places in comp.  26 seconds in, can see mean.

 

now, when render out, there no problems, it's tough work on when aren't sure looks like.  i've had happen in other projects particle producer nested null controls movement.  don't know if that's related or not.  ideas??

 

thanks,

lee

turn off disk cache in prefs. ae showing invalid frames whatever reason.

 

mylenium



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