map the button that dosnt work to the LCD.
do a firmware upgrade, update the remote.
if you can use the button with no issue from the LCD, its a hardware issue, e-mail tech support.
button mapping to LCD, this is for 1000 but it applies to all remotes
http://logitech-en-amr.custhelp.com/cgi-bin/logitech_en_amr.cfg/php/enduser/std_adp.php?p_faqid=9185
firmware steps:
1. Log into the Logitech Harmony Remote Software on your computer
2. Click on the Downloads button at the top-right corner of your screen
3. Click on the Firmware button. Follow the onscreen instructions to upgrade the firmware on your Harmony remote
4. Once the firmware upgrade is complete, click on the Update Remote button
5. Test your remote.
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