The update to 9.8.0 seems to have broken the Order Advanced templates. Probably this specific "fix"? Fixed XML export sites not being loaded in export templates
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After testing a bit, I created a new Virtuemart advanced order template as well and that works initially. However, as soon as it saves the XML layout to the database, you cannot reopen the template, as the loading of the JSON with the XML layout causes an error.
Cheers,
Roderic