Looks like there have been some minor changes to the menu layout in the Canvas community. Was there an announcement that this was happening? I must have missed it.
Up until a few days ago, there was a link for Inbox/Activity on the menu that appears when you click your avatar in the top-right corner. I often look at this for private messages or notifications that people have replied to my posts. Just in case anyone is wondering how to get to the Inbox now, click the @ icon in the corner next to your avatar. It took me a while to work it out - how long has that icon been there?