All Reason patches, combinatiors play half a step higher.

[alisonmusic]

Hi, I'm new here.
I use Reason Sounds, patches, instruments for live performing. I run reason as a rewire in Ableton. The problem that started out of the blue is; that when I select a keyboard patch the sound plays half a step higher than the note I play on my keyboard controller. for instance, I play a C note it will sound as a C#. Ableton patches and instruments don't do this just Reason. I have tried using a different keyboard controller, no difference. I have uninstalled and reinstalled both programs, no difference. I have run Reason as a stand-alone Daw, it still does it no matter what sounds I choose or what combinator I choose. I have a gig coming up and I don't want to be transposing every patch I use on the fly to play in the proper Key.
I have windows 10 and the latest Reason software that has all updates.
Thanks for the help in advance.

[antic604]

Chceck your master tuning in Preferences - maybe it's not set to 440Hz?

[SynthRatings]

Is your MIDI keyboard's transpose setting set to +1 semitone?

[alisonmusic]

Thank you,
you saved the day and many hours of frustration.