Have you tried out Gmail’s new inbox groups? They’re kind of nice, but I’m not a fan of the pre-defined categories. I’d rather see those tabs as some of my labels. That’d be much more productive for me.
If you want to switch back to Gmail’s Priority Inbox first click on the gear icon and go to Settings.
Then click on Inbox and change the Inbox drop down to Important First.
If you go down to the ‘Save’ button, you’ll see it’s disabled. That’s a bug somewhere in the Gmail system. However, if you now switch to the General tab and make a change somewhere in this section, the Save button will become active.
Now hit Save and Gmail will reload. When it loads, your priority inbox will be back.
You now have Priority Inbox back in action.
I also found out that on the Inbox settings page you can customize your Priority Inbox which is pretty sweet.