Hmm, maybe that is the difference then - I've never had more than one gmail account defined in the Gmail app. I use Gmail for my personal account and the stock "Email" app for my work account - that's it.
Are the other folks with serious Gmail stability issues using multiple gmail accounts?
I wouldn't term my Gmail issues "serious", but I have some minor issues (occasionally closes without warning or a force close dialog, frequently doesn't load new posts, doesn't mark them as read after I've read them [either in-app, on gmail, or both], or simply doesn't load things when I tap on them).
I have only two accounts configured in Gmail; my primary which is used quite a lot (up to a dozen or two emails a day; lots of categories), and a secondary that gets maybe a few emails a week (very few categories).
Neither are set to sync very many email categories.