On Mac. Colours changed after switching to 64bit mode (ver 2.7)

Been using Lightroom 2.7 on my iMac quite happily and after reading a few articles realised it wasn't running in 64bit so changed it.
Now colours are all out, most noticeable on reds:
Before change
After Change
Any ideas why this is happening?
Tried changing back to 32bit and still the same so something has changed.
Thanks
Andrew
P.S Posted this on another forum and just to clarify here also, whilst the above are exported jpegs, these are used purely for illustration. The colour change is happening within lightroom itself, not on export.

After some advice elsewhere it seems I have 'lost' some of the camera calibration profiles.
I only have ACR3.1 and ACR4.4 listed and checked on another machine I used I normally have it set to Adobe Standard.
So, how can I get the profiles back?
OK. Problem solved. Reinstalled Lightroom.
Usually fixes things

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