If it is also tripping the breaker in your main electrical box, you might have a safety hazard. I'd call your electrician ASAP. Since another outlet is also affected I'd guess it's in the main box. Please be careful!

* Robert Wilber Licensed Philadelphia Electrician Philadelphia License # 3516 - 16765 * (LIFE SAFETY WARNING! [disclaimer] Electricity is dangerous! You can be injured or killed! Improper installations can cause fire, injury and death! Should you be doing this yourself?) * Are you qualified to do this work? * National Electrical Code definition, NFPA 70 2005 Article 100 I: Qualified Person. "One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training on the hazards involved." * TURN THE POWER OFF! You are more likely to be killed by 110 volts than any other voltage [110 volts creates the PERFECT fatal current through the human body's electrical resistance!] * LIFE SAFETY WARNING! [disclaimer] This information is provided for the use of parties as they see fit! I am not responsible for the application of this information by any party, including those lacking sufficient skill or knowledge to perform these steps safely and any hazard created is the SOLE responsibility of the user. * If you are tripping the GFI, then you have a ground fault. [Especially since you replaced the device and it still happens] It can be due to the hot or the neutral leaking a minute current to ground. If you are absolutely certain that only these two locations are affected, then the fault is at either of these locations [or in between] It may be found, by examining both locations, that a ground wire has been pressed against the neutral conductor, allowing an alternate path for the neutral, which will trip a GFI. If the device trips and there is no load connected, the hot is faulted. Remember that a GFI monitors the imbalance between the hot and neutral. Just because it only happened now doesn't mean that the condition hasn't existed for a long time. The ground wire may just have finally worked it's way through the conductor insulation. Since the power is off while you are doing this, you can use an ohmmeter to check conductor resistance to ground. * Still stuck? Find me with Google and send me an E-mail or call *