Solution for non-synching issue
I have a Motorola Photon that I got about a month ago. I have spent ALL that time trying to figure out why my Gmail wouldn't synch (and why I didn't have the "check boxes" under my accounts tab that people were referring to. After searching the web I found this solution that worked for me:
press the center of your screen or anywhere for a longer pause till the "add to screen" box pops up.
click the "widget" icon.
Scroll down to "power tool".
Tap power tool to bring it to your home screen.
From here just tap the fourth icon from the left....when you do it will display a green line under it.
Your ability to sync should be restored as well as the check boxes (under accounts).
Hope this helps save someone else the headache. Once you do that procedure above you can then remove the widget from your screen if you want to. (just make sure you don't accidentally un-check it)