Hi David,
While doing some search, I came across this section which is not visible yet publicly in the docs but will be by the end of this week:
(This is about migrating from 6.02 to 6.11)
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When migrating from the v.6.02 to Adobe Campaign v6.1 build 8670 or above, then certain files delivered beforehand are not delivered with these builds.
If a client error appears, you have to either update your dashboards with the new Adobe Campaign v6.1 code, or manually copy the following files from the v6.02 instance to the v6.1 instance.
v6.02 files and spaces:
/usr/local/neolane/nl6/datakit/xtk/eng/css/dropDownMenu.css
/usr/local/neolane/nl6/datakit/xtk/eng/js/client/dropDownMenu.js
v6.1 files and spaces:
/usr/local/neolane/nl6/deprecated/xtk/css/dropDownMenu.css
/usr/local/neolane/nl6/deprecated/xtk/js/client/dropDownMenu.js
This process is not necessary if migration to Adobe Campaign v6.1 is carried out on a build earlier than 8670.
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Also, please consider what's mentioned in this page: General configurations, where you'll find extra information about configuration specificities that might require some attention. For example, about Security Zones that were introduced after 6.02.
Let me know if that helps while waiting for an update from support.
Florent