Exported JPEGs Distorted in Shadow Areas

I own a Nikon D7000 and I shoot 14bit RAW.
In Lightroom 3.3 the preview images were distorted, only in development mode the images were fine. I reported to Adobe on this and they seem to have fixed this issue.
In Lightroom 3.3 -- and still in 3.4 -- the exported JPEGs are distorted when the exported image is resized:
A lighter version of the same crop (for illustrative reasons):
As you can see, the gradient has serious artefacts, especially when going from green to black. It is a 90% JPEG quality exported of 1050px width. I have seen this for different image qualities (80-100%), though. This does not occur when the image is exported full size.
Can anybody confirm this?
It seems that this only happens for dark shadows.
I had a Canon G9 that I used with Lightroom and I have never seen a behaviour like this. Right now the export is useless to me.

I've had some discussions about this with Adobe folks during the LR 3 beta phase, but that is all behind a wall now. I think they did put in the dithering into Lightroom now. I still think it is your monitor profile. Also realize that the displays in laptops including the MacBook Pros are not actually full 8-bit displays and you will always see some banding in them. See for example this page: http://www.lagom.nl/lcd-test/gradient.php My guess is that that will show banding on your machine in the shadow areas. Also another issue is that you have to look at these displays at precisely the right angle because you will get raised shadows by quite a bit if you look at them just a few degrees off. One thing to do is to use a test image ( I use monitor_test_txt22.png from this page: http://www.normankoren.com/makingfineprints1A.html ). When you squint the image should be uniform. If not slant the display until it looks uniform.

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