Thin horizontal black line at BOTTOM of page when scan on HP Officejet Pro 8600 Plus

Question

I owned an HP Officejet Pro 8500 and scanning was perfect.  I recently purchased an HP Officejet Pro 8600 Plus.
When I scan from the HP 8600 auto document feeder, I get a thin (several pixel wide) black line along the bottom edge of the resulting scan.  This line will sometimes be slighly crooked or only appear across half the page, in which case it tends to get thicker toward the edge of the page).  I believe this line is an artifact from scanning the very bottom edge of the oroginal document.  I think it is showing where the bottom edge of the page was when scanned.  If the document is a little skewed, then the black line at the bottom will be a little crooked, probably following the edge of the page.  This problem is consistent, and repeatable.  It happens in both "Scan To E-mail" mode and "Scan To Network Folder" mode.
When I scan from the flat bed, I get a very narrow black line along the very top edge of the resulting scan, but the bottom appears fine (although I've not tested this extensively).
These thin black lines did not occur when scanning from the HP 8500.
I am wondering if there is a setting to adjust this, or if it is a firmware difference between printers that needs debugging.
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Answer 1

I find it interesting that the issue happens across both printers.  This is what leads me to believe this is something with the software/connection with the PC.  One thing I will note is that you mentioned above using Adobe Reader 10.1.6.  The latest version of Adobe Reader is 11.0.02.  I would advise removing your current version of Adobe Reader and install the latest version. 
I am not sure if this will fix the issue as you mentioned the line comes across in jpeg and other scanning styles.  Do you possibly have another PC you could try setting up a connection with quickly and attempting a scan?  This would be another way to ensure if the issue is coming from the printer or a connection/software issue.
I would like to make sure the issue is coming from the scanners on these printers before returning the printers as I would hate for you to get another model printer and the issue remain with this printer as well.  However, I will note that the Laserjet Pro 200 is a nice series printer from my experience.  I have used the Laserjet Pro 200 black and white only edition, the MFP, and the TopShot edition where I am located.
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