action_err_ns on migration

Hi folks,

Ran into this issue recently with revo 2.1.5 where we switched hosting providers, migrated content over, and now we can't save content or access pieces (like users, reports, etc) in the admin because we keep getting "action_err_ns." Not sure what might be the issue.

Apache
php 5.2.17
modx revo 2.1.5-pl
MySQL 5.1.61

Process followed was copying all the files over, export and importing the database, changed the paths in the config.inc.php files, changed the path in the database modx_namespace table, ran setup and got no errors there. The frontend of the site appears and works fine. We can also log in to the manager and see content, chunks, snippets, etc, but any saves results in "action_err_ns" appearing. Firebug doesn't throw any errors.

Wondering if it's still a namespace issue or what.... but if it was, then the rest of the site wouldn't work, theoretically. Hostmonster is the new host, if that matters.

Any thoughts or suggestions?