Pixel Preview doesn't match exported PNG

I use Illustrator CS4 for icon design, so Pixel Preview is a pretty important feature for me. Unfortunately, I just found out (the hard way) that Pixel Preview isn't accurate - it doesn't show you exactly what you'll get when you export a PNG via Save for Web and Devices.
Here's an example from my current project that shows the problem (enlarged 4x):
A screen snap from AI with Pixel Preview off:
A screen snap from AI with Pixel Preview on:
The exported PNG file:
Look at the center of the second image: See that dark gray line bleeding from the light gray circle into the black area? Now look at the third image: The line isn't there.
(Please don't fixate on this one example. Since I noticed the problem, I've found inconsistencies all over the place. This one was just the easiest to see.)
If I can't count on the absolute, pixel-for-pixel accuracy of Pixel Preview, then this feature becomes worse than useless in my work, because it actually misleads me into making small tweaks that make the final output look worse.
If anyone knows of a workaround (or a setting that turns on "accurate mode"), I'd love to hear about it.

I can't state this definitively, but the inconsistency seems to happen with gradient fills. (The light gray semicircle in the example in my original post has a gradient fill with a pretty abrupt transition from light to dark.) Maybe the issue is specific to gradients?

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General
Complete name                            : Z:\NikonVideo\MomsStory\JDB_20140702_6537.MOV
Format                                   : MPEG-4
Format profile                           : QuickTime
Codec ID                                 : qt
File size                                : 1.46 GiB
Duration                                 : 10mn 32s
Overall bit rate                         : 19.8 Mbps
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-15 03:24:05
NCDT                                     : NCTG
Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : [email protected]
Format settings, CABAC                   : Yes
Format settings, ReFrames                : 2 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 10mn 32s
Bit rate                                 : 18.3 Mbps
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 fps
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.368
Stream size                              : 1.35 GiB (92%)
Language                                 : English
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-02 18:22:46
Transfer characteristics                 : BT.470 System M
Matrix coefficients                      : BT.601
Audio
ID                                       : 2
Format                                   : PCM
Format settings, Endianness              : Little
Format settings, Sign                    : Signed
Codec ID                                 : sowt
Duration                                 : 10mn 32s
Bit rate mode                            : Constant
Bit rate                                 : 1 536 Kbps
Channel(s)                               : 2 channels
Channel positions                        : Front: L R
Sampling rate                            : 48.0 KHz
Bit depth                                : 16 bits
Stream size                              : 116 MiB (8%)
Language                                 : English
Encoded date                             : UTC 2014-07-02 18:22:46
Tagged date                              : UTC 2014-07-02 18:22:46

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Thank you for your response and I apologize for the delay in mine. I couldn't try all of the fixes immediately because I had to complete some job duties before I could tinker with this issue.
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Closing Firefox
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