Odd "progress bar"-like window opens occasionally, Windows Task Manager associates it with AcroRd32.

We've had a few users report an odd grey "progress bar" style window open up when Adobe Reader is open.  The box has no title bar and no activity is displayed. 
There is no close gadget or other buttons, just a blank space that looks like a progress meter.
It doesn't happen all the time, but it does only seem to happen on the computers that are running DisplayLink.  These would be Windows 8 (32-bit or 64-bit) or 8.1 (64-bit) installs running on Microsoft Surface tablets or Dell Latitude E-series laptops.  We have a number of Win8x machines out there, but the box only appears on those running DisplayLink.
If the box appears, opening Task Manager typically shows multiple (more than 2) instances of AcroRd32.exe running, and closing them all (one by one) through Task Manager will make the box go away.
We don't see anything get recorded in the Windows logs.
I know of two instances where this has occurred that were on Surface tablets where the user was just coming in for the day, waking their tablet from sleep (not a cold-start), and one of the first things they did was open a PDF file.  I cannot say whether the wake-from sleep is also a commonality or not as this "progress bar" box appears randomly and infrequently.
It has been observed on machines running Adobe Reader XI and X.  It occurred this morning on a tablet that is running the latest XI 11.0.06.  It has been observed on machines running various versions of DisplayLink, including the latest public release.
Any ideas as to what might be causing this box to appear?

Hi,
You can consider the [https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems Reset Firefox] feature via '''Help''' ('''Alt''' + '''H''') > '''Troubleshooting Information'''. If the problem persists, please also try to '''Disable''' the Yahoo Browser Plus '''Plugin''' in '''Tools''' ('''Alt''' + '''T''') > Add-ons''' and possibly other related plugins.
(To revert to the previous profile you were using, close the new profile (i.e. exit Firefox), start Firefox and choose the '''Default User''' profile. While the [https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Profile Manager] is open, you can also delete the newly reset profile (the one containing random numbers), or the former profile, as the case may be).
[https://support.mozilla.org/en-US/kb/Managing-profiles Managing profiles]
[https://support.mozilla.org/en-US/kb/Profiles?s=profile&r=2&e=sph&as=s Profiles Howto]

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