The strangest error, as CKEditor works fine for some user types, but in others (authenticated user) it won't display in the *edit-body fields in cck node edit and node submit forms. But it's not strictly a user role problem, as I can get CKEditor to display in other text fields that are not edit-body of nodes. The cck field in question is the default 'body' field, so there's no way to choose between plain text/filtered text (probably not an issue as it works for other roles anyway)
I feel like I've tried everything:
-frequent cache clearing;
-uninstalling reinstalling CKeditor;
-upgrading/downgrading both the module and the CKeditor library (6.x-dev is currently installed)
-enabling/disabling all kinds of modules identified as potential conflicts from this queue and elsewhere.
But the I've been trying to pin this down for days, and now at wits end. Any other advice on any other possible paths to troubleshoot?