Lately I've been experiencing problems with my Gmail app. There is no push notifications at all. I have to go into my Gmail and manually refresh it for it to even pick up I have new e-mails.
I have been using SEVERAL different ROMs with all the same problem. Currently running Nightly Build 7 of Cyanogen which for me, is running flawlessly.
I was able to use my Gmail in the default Email app but that doesn't get instant pushes like Gmail did, it has a set refresh rate.
I have uninstalled and reinstalled Gmail several different times from the market and I get the same thing every time. I have gone over and checked the settings in Gmail and can't figure this out.