The ReWire and Utilities issues are separate. IIRC Reason 5 was a 32-bit program and the ReWire DLL is 32-bit as well, and will not work with 64-bit SONAR. Propellerheads did come out with a 64-bit ReWire DLL but I don't think it's compatible with 32-bit Reason. FWIW Propellerheads no longer offer a 32-bit version of Reason. If SONAR did the same it would probably cut the forum traffic in half