A little background:
Between my wife and I, we own 3 plots (The 2 between the Heather Destination Pad and the Heather Gate, and the one directly South of the Heather Gate). We have been building on them for the past few weeks.
The problems:
Sunday, while doing construction on one of them, I lost the ability to target some of the scaffolding. I was able to target others, though. When I attempted to open storages on our other 2 plots, I found that I could not even target most of them. When I hovered and clicked, I would target a plot, or lair, some distance away. It's like our buildings/silos don't exist. My characters can walk through the walls/floors, and even some of the trees on the world terrain. The vault that is on another plot is accessible, but again, the building seems to not exist, as I can walk through the walls and floor.
Another thing I've noticed: When I first log on, I can usually access all of the storages on our two "main" plots, but when I go to our third plot, I can only access some of the storages there, while the others are not target-able. When I go back to our "main" plots, I am unable to target most, if not all, of them. Also when this happens, I can't target, or get the destination menu from the teleportation gate.
As far as I can tell, this is isolated to Heather. I haven't noticed any odd activity in the world cities or player towns.
I have cleared my world cache twice, deleted the resource folder, and ran the full file scan twice to replace the deleted resource files. This problem persists.
The only add-on I am using is the map-pack.
I think that covers everything.