I just noticed this... When my Gmail syncs, I get a notification. For every new email, I am getting 2 different notifications, with slightly different Gmail icons. Please have a look at the attachment.
I've asked this before, but those icons look slightly different. If you tap on each, do they bring you to the GMail app, or do the bring you to another app? (Notice what I highlighted.)
Also, see my comment below, but if you tap on each icon and (in gmail) right away do menu->more->about. Are they the same GMail version?
I use the MikG ROM (on EVO 4G) and I think it is what adds this shortcut, which appears to just be a shortcut to Menu > Settings > Sound > Notification sound. When I changed it in the "Personalize" area, it also changed it here (to Silent).
This sounds unlikely, but it is possible that this ROM includes an older version of the GMail app in the ROM and then you installed a second copy from the market. Really, apps you install from the market should replace system apps that are older versions. Do you have two GMail icons in the app drawer?
Anyway, this forum is for the Droid 3 specifically. This may explain why your phone and my phone (which is a stock D3) are quite different. You really may want to ask this question(if what I listed above did not help) in the All Things Root thread in the EVO 4G forum here: EVO 4G - All Things Root - Android Forums
