I spent a couple of hours trying to add a Gmail account to the Palm Pre Plus w/ WebOS 1.4. I even engaged Palm live online support, to no avail. After a little experimenting, I figured out what the hang-up is. When adding a new Gmail account, avoid an account name with more than one "." in it.

"one.two@gmail.com will work where as "one.two.three@gmail.com" will not. It may not a big deal, but it could have kept me from having to create a couple of additional Gmail accounts.