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"The content of elements should consist of well-formed character data or markup" in Cloud Console

Hi. We have a managed package which includes a Visualforce page that can be used in the Service Cloud Console. Occasionally, when using the console javascript API to refresh/close tabs we get the error "Warning: The content of elements should consist of well-formed character data or markup at line 5" in a yellow warning box. This only occurs in the console in an installed org (never in the development org of the package). I looked at line 5 of the source of the page and didn't see anything strange. I found this post but it doesn't seem to be the same issue because the page cannot even be edited in installed orgs. Unfortunately, the page is too large to paste here and it includes various javascript and CSS files, but I'm hoping somebody has seen this before. Has anyone come across this warning this before? How did you narrow down the markup which the parser is complaining about? Thanks.