We are having an issue passing a check-sum from a donation and membership sign up form along with a token to sign up to join a mailing list. We're implementing CiviCRM on a WordPress platform. The newsletter mailing list sign up token is not recognized by the system.
You might compare your checksum links against the examples in this post.
As for your mailing list signup form, I'm not sure what you mean by "not recognized by the system". Is the token not transforming when sent, or is the link just not working?