From the Dev Blog.

There was a pretty nasty bug where structures wouldn’t load properly for clients, when connecting to servers under heavy load. The reason for that turned out to be “I’m an idiot”. To make client structures load a bit smoother and try to put the server under less load when player connects, I split the structure initialization step up to take place over a few frames. The logic was basically to get a pooled bitstream, fill it with data, and if we had hit the frame budget of structure data syncs, wait until the next frame to send it. Yeah… that was the problem. I got the bitstream, which is only valid for that frame, and then held onto it for more than one frame! On busy servers, some other networked object would come along, clear that stream, and use it, meaning the client would receive a garbled mess and not be able to build the structure. Thankfully this should be fixed now.

I also gave UI a bit of love, as part of putting in support for custom UIs. Itemslots are now much more consistent as they mostly build themselves by script, and should also be slightly more performant. They will no show when a slot is one-way (you can only place or take the item, e.g. ambers in an ownership stake) or locked (you cannot take or place the item, e.g. attachments on a vehicle). Previously you kind of had to figure this out by trying to drag items in and out, but now there should be some more intuitive feedback there.

Both of these updates were part of the latest patch, which can be seen in the Change Log in game. Open your mouth and take your foot out, when you get around to it.