PDF Optimizer Causes Disappearing Lines in Maps

I often have to optimize PDF maps created in ESRI ArcGIS to reduce the file size. This works great most of the time but some PDFs have lines that disappear every time I optimize, regardless of the settings.
Some notes:
- The same line will disappear even when all of the optimize options are turned off (i.e. it should be doing nothing to the document).
- The layer that contains the line still shows up in the layer tab, but turning it on or off has no effect
- Printing to PDF works fine, the line does NOT disappear (though the file size reduction isn't as great)
- The line that usually disappears is ~425 miles long, though the map only covers a few miles of it
- This happens on multiple computers, running the latest version of Acrobat Pro 9 on Windows XP.
- This also happens on the same map regardless of which computer exports the map to PDF in the first place (even using different versions of PDF)
- I can replicate the effect by manually deleting the tags from the document. As soon as I delete the tag, the line disappears (though the layer remains)
This has been a very frustrating problem and I would greatly appreciate any suggestions. I have scoured the internet for similar problems, but could not find anything useful.
Before Optimize:
After Optimize:
Thanks,
Justin

I don't have a solution. but do have a little more info.
The original file includes the following in the page Contents:
0 0 0 RG 1 1 1 rg /OC /OC0 BDC /OC /OC1 BDC q 0 0 m 0 792 l 612 792 l 612 0 l 0 0 l h W* n q 573.8537 0 0 -473.77355 19.92048 774.71951 cm /Image_3 Do Q q 573.8537 0 0 -232.56665 19.92048 301.66598 cm /Image_5 Do Q Q EMC /OC /OC2 BDC q 593.05416 70.29936 m 19.92048 70.29936 l 19.92048 774.71951 l 593.05416  774.71951 l 593.05416 70.29936 l h W* n 1 0 0 RG 1.44003 w 1 j 1 J 10 M -35395.08504 45774.32631 m -35395.08504 45769.04616 l -35373.72453  45745.28548 l -35329.32347 45688.40386 l -35246.5215 45582.80084 l  -35118.83845 45419.35616 l -35116.9184 45417.67611 l -35105.15812  45410.2359 l -35090.99778 45401.59565 l -35089.0777
Whereas the optimized file includes:
/OC /MC0 BDC  /OC /MC1 BDC  q 0 0 m 0 792 l 612 792 l 612 0 l 0 0 l h W*  n q 573.8536987 0 0 -473.7735443 19.9204865 774.7195129 cm /Im0 Do Q q  573.8536987 0 0 -232.5666504 19.9204865 301.6659851 cm /Im1 Do Q EMC  Q /OC /MC2 BDC  q 593.054 70.299 m 19.92 70.299 l 19.92 774.72 l 593.054  774.72 l 593.054 70.299 l h W* n 1 0 0 RG 1.44 w 1 j 1 J  q 1 0 0 1  -32768 32767.9999 cm -32768 32767.999 m -32768 32767.999 l -32768  32767.999 l -32768 32767.999 l -32768 32767.999 l -32768 32767.999 l  -32768 32767.999 l -32768 32767.999 l
Note that in the optimized version the third restore operator is outside the marked content. The BDC/EMC block has three q operators and 2 Q operators.
The same is true of /OC2 - your redline layer.

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