Reason sounds a half step off from Kontakt sounds

[sonja]

Why do Reason sounds play 1/2 step off from Kontakt and how can I fix it? Kontakt is correct and Reason is 1/2 step low.

[avasopht]

I've got Kontakt, and they're both playing the exact same note for me.

Do you have one of them set to a different master tuning by any chance?

[jam-s]

Have you enabled delay compensation? You could try if it is related to this.
EDIT: OK, with step you seem to mean note pitch and not timing. Then you could check if some synth got detuned or has pitchbend set to non-zero.

[huggermugger]

Double check your master tuning in Reason. It should be 440Hz. If it's not, none of your VSTs will be in tune with Reason's instruments.

[ReservoirDoge]

Just check the master tune and/or the sample rate of each of your DAWs, it shouldn't be different. Edit: sometimes also in the VI itself !!