How to make manual MTU settings stick?

Hi all,
After 3 1/2 weeks of troubleshooting with my new ISP for problems loading some webpages, they told me to change the MTU settings from 1500 to 1400 in System Prefs > Network > Airport > Ethernet . When I do this all is good and websites load. Hooray!
However, each time I reboot it goes back to 1500. Annoyingly enough it says  "Confirgure manually" and "MTU Standard 1500" and won't let me change it then. I click MTU and Custom and it comes up with 1400 in the box. I click OK, then Apply and then exit the system prefs. However, it doesn't stick. If I open it back up it's back to "Confirgure manually" and "MTU Standard 1500".
I have to run the chrons and fix permissions and then it will let me reset it to 1400 and it will stick. Until the next time I reboot.
Does anyone know of a way to make this stick?
Thanks.

A new location didin't help. I finally called Applecare. We deleted the airport and network configurations from the harddisk >library>system config folder. Created a whole new configurartion. But it didn't work either. I booted into a clone, ran Disk Warrior, and then the new configuration worked. Ahah! So I restored the configurations from my clone, ran Disk Warrior, and no dice.
Finally, I restored the config settings (plist files) from the backup, and then deleted preferences.plist file which we had not previously deleted. Ran Disk Warrior again (which may not have been necessary). Rebooted and voila! it is now sticking through several reboots and all my other old network settings are still there.
It looks like there may have been some disk error that corrupted the preferences.plist. Fingers crossed that this fix works.

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