The Activity Stream on the Dashboard has been randomly failing to auto-refresh. Sometimes it just goes blank, and other times it has an "Unauthorized 401" error in it. Ctrl+R brings it back to life.
Open a dashboard
Add the activity stream gadget and configure to show some data
Set to auto refresh every 15 min.
Wait for some unknown time and it returns a 401 error.
The activity stream should load the data, instead of returning a 401 unauthorized error.
Should show the data on the activity stream
Have to manually auto refresh it