Try it in CC 2014 and see if it behaves.
I'll try 2014 this afternoon, but this problem is known since CS6...
With CC 2014 I've got the same bug..
I've not had similar issues, but then I've not tried to use Reshape on an image that size either.
Try duplicating your footage and putting it in a precomp. Make that precomp smaller so that it only contains the part you want to warp. In your main comp, try applying the Reshape effect and see if it behaves.
If that doesn't work and you need official help, I'd suggest contacting Adobe support.
Also, file a bug report so the AE team can see the problem: Feature Request/Bug Report Form
Be sure to mention each version you've experienced the bug in.
It doesn't work with a precomp, and I must reshape from the 5,5K depth, so changing resolution is not the 'easy way' I imagine for this bug...
I request to Adobe Support.
What happens if you pick a frame, render that frame as a PSD and then replace the footage with the still and see if you still get the error. If you do then it's a bug in AE, if you do not it's a bug related to decoding the Red footage. If you do not get the error with the PSD then transcoding the footage to an image sequence would be a way to work around the problem.
I ever try with other footages, it doesn't work!