Thank you for your post.
What error message are you receiving? What is the URL being used?
Marc, in FM Go the "64 K limit" typically occurs on displaying a "text field" in iOS with content that exceeds around 60 K. That seems to be because of an iOS limitation for editing FM Go text fields with content exceeding around 60 K. My workaround for this is to use a "Web Viewer field" to view the text field, define the web viewer with a web address defined to something like:
GetAsCSS ( YourTable::YourTextField )
Hope that helps