PDF Bookmark works on 1st click only :(

Hi all:

I've gotten links to PDFs in my RoboHelp project to work, but have one problem that I cannot seem to solve.  This issue happens with IE and Chrome (have not tried Safari) but not with FireFox.  The first time I click a PDF link from my WebHelp project (yes, it's posted on a server), the help link works fine. The PDF opens to the named destination.  Subsequent links to different destinations in the same PDF, however, update the browser with the proper URL but the PDF does not change to the new location. 

eg:

Link1:

http://10.20.160.7:8080/help/test/cdm_agent_guide.pdf#cdmasi

Displays the PDF opened to the page tagged with cdmasi

then click this:

http://10.20.160.7:8080/help/test/cdm_agent_guide.pdf#cdmacdm

Page seems to be loading but...

URL status bar shows the above URL, but the PDF has remained on the ASI topic (Chrome) or a blank page displays.

Click the URL bar and refresh to load the link

The PDF moves to the correct topic.

Note:

This behavior is the same whether i use foo.pdf#nameddest=string  or foo.pdf#string

Again, if I use FireFox, the pages load great. In IE/Chrome, not.

Deets:

IE 11.0.9600.16428

Chrome 33.0.1750.146

Firefox 27.01

Windows 7

RoboHelp 10

Acrobat Pro X

Acrobat Read 10.1.9

I am pretty sure this is not a security thing or the first instance would fail. Also, it's not a Mark of the Web thing; we dont have that enabled for the project.

Am I missing something obvious about forcing a refetch of the PDF?

D