MIDI notes are all doubled

Are the notes being entered twice in the Piano Roll view or staff view or are you just hearing it twice?
Check all the other MIDI tracks's inputs that they're not also receiving data while you work on another track.

I'm just entering notes using a controller when the track is in Record mode. The controller is checked as an Input MIDI device only, it's the only MIDI device and I'm not overdubbing. Set Record, press keys, notes are doubled.

57Gregy
Are the notes being entered twice in the Piano Roll view or staff view or are you just hearing it twice?
 

This is a key question, rev. It is an important distinction, and we need to know the answer.
With input echo turned off, do you still hear sound?
If so, that means another synth is being triggered. A prime suspect is the MS Wavetable Synth. It runs outside of Sonar, and you can't see it. Make sure it is not selected as a MIDI output device.

This is from the SONAR Home Studio 6 Help files:
My Keyboard Doubles Every Note I Play

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When your keyboard doubles the notes, each note seems heavier or thicker than usual, as if two notes of the same pitch are emitted when you press the key. Also, you may find that you can play only half as many notes at one time before some of the held notes drop out.
This can occur when MIDI echo is enabled. The keyboard plays the note for the key you've pressed. At the same time, the note is sent through the MIDI interface and echoed back to the keyboard, where it is played a second time.
The best way to resolve the problem is to disable Local Control on the keyboard, following the instructions that came with the keyboard. This stops the keyboard from playing independently. The keys you play still produce sound on the keyboard because they are echoed back by the MIDI interface. In many cases, SONAR disables local control automatically when the program is started, but this is not always possible.
It's also possible that your keyboard is transmitting information on two channels at once. To see if this is so, create a new project and record two notes from the keyboard. Then look at what you've recorded in the Event list view. If you see four notes displayed instead of two, then your keyboard is transmitting on two channels. See the documentation for your keyboard to learn how to correct the problem.
 
Since echo is off, check your keyboard's settings.

I 

revnice1
I'm entering notes with a controller and they're all getting doubled.
 
I've got Echo off in the Track View and 'Always Echo current MIDI track' off under Options > Global 
 
What else is there?
 
Thanks - rev

Turn local off on the keyboard and enable echo in the track header.

Some specifics might help here.
Make/model of controller.
Is it going through a MIDI/USB adapter?
General system specs.
Your signature is a great place to put this info, so it is readily available for troubleshooting. That's why you see it in so many of our posts.

I'll make sure it's excluded by Sonar. I agree, I don't think it's broken. I'll try everything and post back.