After upgrading our forums to 4.1.14, all of our sidebar blocks have been moved out of place. Rather than on the side of the forums where they should be, they have all been moved to the bottom of the forum. Current blocks cannot be moved to the side. It's as if the normal "spot" for sidebar blocks has been relocated to the bottom. Also, some of our footer blocks are moved as well. I was expecting this to be a custom theme problem, but it persists with the IPB default theme as well. Is anyone else experience something similar? 

 

Edit: FIXED. Problem was the plugin "Who Was Online". Disabled and everything works again.

Working fine here. Try disabling your plugins to check if its that.

Found the culprit! For anyone else that may experience this problem, it was this plugin that was the issue:

 

I'm having the same exact issue but I don't have any plugins installed. 

So strange! But thanks for sharing.