I saw this a few times prior to upgrading to 10.11.5, but it has happened twice now. iMac 27" (Retina 5K, 27-inch, Late 2015)) goes to sleep... I wake it up, it wakes up and presents me with the login (I need to select the user and enter the password). When I enter the password, it goes to "stuck beachball". One time it did this and recovered after 10 minutes, just recently it did it and after 45 minutes it was still balling... So I was forced to hard power it via the power button on the bottom left. While it is balling, I can ping it. It is also generating logs in the console. I can ever access the HD remotely. Ugh! Quite frustrating, Apple. Anyone have any thoughts? Oh, BTW, I got this Mac a few months ago have an intentionally not installed any crap on it. It doesn't have flash, it doesn't have VMware Fusion, it's basically clean with the exception of the Office suite and some other apps. No kernel extensions. Oh, when in this state there is usually an email notification in the upper right. I can move the cursor and the cursor moves (it is a ball). If I move it over the notification area, it turns into a regular pointer. However, clicking performs no action.