I may have found the answer. There may also be version issues at work.
The workflow which generates the report is using the Survey XML Report.
Somehow, attribute values in the FWD were not being written correctly to the XML file, but only in certain versions.
Whatever version are on my PC, when the FWD was opened and an XML Report created, the XML file was well formed. But on the other PC's an attribute value of 6" PATIO DRAIN was not properly written to the XML file.
The attribute, in Notepad++ looked like this:
<SurveyAttribute name="TY" value="6[] PATIO DRAIN"/>
Where the [] was some type of extended character. And when I created a report form this, is seemed to ignore the character.
But on the other PC's, it converted it to a regular double quote ( " ) in the XML file, instead of " which made the attribute line not a well formed XML line. The browser saw the attributes value as "6" and then did not know what to do with PATIO DRAIN" still in the line.
I edited the FWD to change the characters to IN and the error disappeared.
I changed fonts in Notepad++ to Arial and the [] displayed as ”
So beware of extended characters in what should be ASCII files.