Export changes the black point

I've noticed that when exporting from LR4 (and LR3 for that matter) that on certain photos with deep blacks, the black point gets shifted during the export (for lack of a better term)
By this, I mean that on some of my dark (i.e. night and or low key shots) what I see on the screen in the develop module is a nice even gradient from 0,0,0 to whatever comes out of the shadow. When I switch to Library module, the blacks get a little pixelated in some areas in that view. If I then export the photo the blacks are blocky in the rendered .jpeg.
If I take that same photo and export it to CS5 as a 16 bit .tiff, all my smooth tones are preserved. If I save that file from CS5 for web and devices (at the same resolution as I do for LR, i.e. 1024px wide) then what I see in that CS5 rendered export is what I saw on the screen during my editing.
I had/have this issue with LR3, and work around it by exporting those types of photos with CS5, but it would be nice to not have to play that game.
A while back I asked this same Q re: LR3's export behavior and an employee (Ben Warde I believe) asked for some sample files. I sent them along but alas have heard nothing back.
So, um... can we try again? Has anyone else had this issue? Does LR use a different export method/algorythm than PS "save for web and devices'?
I'm 100% certain it's not a corrupt monitor profile or a calibration issue as it happens on both my calibrated Macs (MBPro and iMac), and when I edit, I see nice smooth gradients from black to shadow, and CS5 makes a nice export, it's just LR that pixelates my darks...
I just want my exported jpegs to be WYSIWYG out of LR, just like they are from PSCS5...

I apologize for asking you to do this again, but please send me sample files. You can contact me at [email protected] (personal email); feel free to use YouSendIt.com, dropbox, etc.
(I suspect what you're seeing is the difference between the Ps and Lr JPEG compression system -- yes, they're different.)

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