Just in case anyone else has the same problem I had that induced the “This URL… could not be launched.” error …
My problem was associated with some text changes I did when I accidently didn’t choose the field to change. That left the default of “Any Field”, so when I changed all “/” to “;” to tidy up my keywords it also changed the "/"s in the File Attachment fields which broke all the links. It was then fairly straightforward to go back and change the ";"s back to "/"s and get the links working again.
The lesson which I need to learn is to be very careful about using “Change Text” as the default is “Any Field” which can be deadly as there is no warning.
Thomson: could you put a warning message in the Change Text box when someone tries to do a change without selecting a specific field? Or better: force a selection of field and give an option of “Any Field” but only by selection not default?
Thanks!