Maintenance for the week of December 16:
• PC/Mac: No maintenance – December 16
• NA megaservers for patch maintenance – December 17, 4:00AM EST (9:00 UTC) - 12:00PM EST (17:00 UTC)
• EU megaservers for patch maintenance – December 17, 9:00 UTC (4:00AM EST) - 17:00 UTC (12:00PM EST)
August 2016 would have been between DB and One Tamriel. So not the Housing patch, or any particular patch at all. In fact, going through the forum Search function, this appears to have cropped up occasionally since release.
This seems to be related to a faulty launcher. The first step is to run the launcher's Repair utility and, if that doesn't work, delete and redownload your launcher. There is a mod post that goes through that process step by step here.
I also found this thread, which may offer another solution.
If all else fails, submit a support ticket. The support system is rather notorious for auto-responses though, so I'd try the above first. If you end up opening a ticket, be sure to keep responding to the emails so they don't close your ticket.
Good luck!
Living vicariously through my characters.
My Girls:
"If you were trapped in your house for, say, a year, how would you pass the time?"
Nephikah the Houseless, dunmer assassin: "I suppose I could use the break. I have a lot of business holdings now that need management." Swum-Many-Waters, elderly argonian healer: "I think that I would enjoy writing a memoir." Silh'ki, khajiit warrior-chef: "Would this one be able to go outside, to the nearby river? It's hard to fish without water!" Peregrine Huntress, bosmer hunter: "Who is forcing me to stay inside, and where can I find them?" Lorenyawe, altmer mechanist: "And why would I want to go outside in the first place? Too much to be done in the workshop." Lorelai Magpie, breton master thief: "I'd go nuts. Lucky for me, I have a little experience sneaking out!" Rasheda the Burning Heart, redguard knight: "I would continue my training to keep my skills sharp." Hex-Eye Azabi, khajiit daedric priestess: "I suppose it would be lucky, then, that I built a shrine to Mephala in my backyard." Yngva Stormhammer, nord bandit (reformed...ish): "I hate being inside even when I'm not forced to be. GET. ME. OUT." Madam Argentia, vampire dunmer aristocrat: "I suppose it would be more of the same. I have a rather... contentious relationship with the sun." Mazie gra-Bolga, orc scout: "Uh... I'd have to house train my bear..." Felicia the Wanderer, imperial witch-for-hire: "What Lorelai said." Calico Jaka-dra, retired khajiit pirate: "This one would like a rest from her grand adventures. Her jewel shop runs out of stock!" Shimmerbeam, blind altmer psijic: "Provided that I am confined to Artaeum, I do not think I will want for things to occupy my time." Shauna Blackfire, redguard necromancer: "Sounds like paradise. I hate people." Kirniel the Undying, cursed bosmer warrior: "I would feel useless, not being able to fight." Echoes-from-Dragons, argonian who thinks she's a dragon: "All the better to count my hoard!"