Fixed in what way? I prefer Apple's Mail app, but I use the Gmail app when I want to look at a label or something, and it seems to work fine.
Key feature missing in Apple Mail is sorting by "Important and Unread". I get so many emails, any app without this is unusable. I use the GMail app.
I have an issue where at least half the time I need to force-close the app, otherwise it hangs trying to load new mail. Happened on my iPhone 5 and happens on my newer 6.
I also have this issue. Also, on three separate occasions one of my accounts has just disappeared and I've needed to re-add it.
Almost without fail, switching between my personal and work email accounts causes the app to hang and I have to force-quit it. A fix for that would be nice.
There is Inbox now
Inbox is a fairly different product and not a replacement for everyone