Just wanted to pop in and let you folks know that we're aware of an issue that affects a small portion of our users that have a large quantity of items. A current work around is to manage your items via the web at https://offerup.com/selling/.
@Sanee when you attempt to load the offers from the app, do you see a loading spinner indefinitely?
As for anyone not receiving notifications for user messages, we started rolling out a fix yesterday. You can manually update via the app store or you can log out and then log back in to fix the issue.