Sibelius 7 playback crashes with ReWire and Logic Pro X

Hi everyone! I am trying to ReWire Sibelius 7 and Logic Pro X on a 10.10.5 MacBook Pro OS X Yosemite. I have it set up already on the aux channel input and everything appears to be in order, but when I open Siblius, I get a notice saying "The ReWire integration of Sibelius 7 is broken. Do you want to repair it now?" I clicked on yes, but when I try the playback, I only get the pin wheal of death. Has anyone else faced this problem and found a way out? Thank you so much in advance!