Retard, (I know that sounds hilarious, but I don't know your name - no offense please! )
Like you said, if this happens only primarily on one of the many sites, it generally comes down to the type of code on that site.
And after looking at the URL you posted, seems like that page uses a lot of external references - JS and CSS.
Especially the last few lines:
Also, a couple CSS, JS references in the <head> section.
'Display External Files' only disables showing external files - but still loads them.
Can you try removing the external references and try working with the webpage in DW for a few minutes to see if the same problem persists? If it does, we know what was causing your issue.
Also, run your site through W3 validator to check and resolve errors: http://validator.w3.org/check?uri=http%3A%2F%2Fwww.healthfirst.com%2Facls-kit.html&charset =%28detect+automatically%29&doctype=Inline&group=0
Let us know how it goes.
One more suggestion - if the code is static but you're referencing it online, have you considered creating a local copy of the file? You could probably even use the local copy while staging on your computer - when you're putting it online, you could revert to a CDN hosted source - if you think that is necessary?
Thank you for the awesome and specific advice. I will try them out. (and I've got to stop picking my user names when I'm drunk... )
I thought the code I was referencing WAS local, but I now realize that you're right; I'll try a local version and see if that helps...
Thanks again for the advice; I'll try it out and see how things go...