I'm running Gmail for mobile 1.0.0 (the new downloadable J2ME app) on a Cingular Motorola V551 (latest firmware: 55R), and it generally works well, except that it sometimes crashes the phone to a white screen and automatic restart. This seems to happen most often when scrolling through my Inbox, although it sometimes happens when just sitting in Inbox view.
I don't think the problem is in the phone (which has the latest firmware) because it runs other J2ME apps (e.g., Opera Mini) well.
Anyone else seeing this problem?