Did you run Setup after moving the site?
Did you manually delete all files in the core/cache directory?
Check the Articles System Settings in System->System Settings to see if there are any paths there.
Check the path in the modx_workspaces table in PhpMyAdmin.
If all that fails, I'd uninstall and remove Articles and download and re-install it.
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PLEASE, PLEASE specify the version of MODX you are using.
MODX info for everyone:
http://bobsguides.com/modx.html