I am alternate executor, alternate trustee, and beneficiary of a trust, which is being mismanaged.

Hello.  You have a few avenues of relief.  Perhaps a stern-worded letter may serve to move the trustee/executor forward, but if that does not work, you could petition the court for an accounting (if none has been prepared by now) and you may also petition the court to  remove the existing administrator from his/her duties and appoint yourself to take over.  The administrator has a very high fiduciary duty to keep you informed and to properly invest all assets.  Forcing the admin to account is often a good first step.