Checked the XML on the source file. First I removed the data source entirely (though two of my other configurations are relying on it) and checked the XML.
I can find two calls to it (same as the # of configs involved with it) ... one from the environment variable and the other for the configuration that relies on it.
I've yanked logging out as well, and that hasn't removed the issue.
I managed to, alchemically, fix one of the packages to stay in 10.1. I have absolutely no idea how I did it. When I got back to the package it had swapped the Environment Variable into a called configuration from a sql table. Reversing this to an environment variable corrected the problem for that package... and even attempting to replicate that process doesn't fix the issue for other packages.
I'm stumped.
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