Alright, so this used to be more of an intermittent thing, but now I can't get it to go away. When I log in and enter the game with my character, not only are there visible, impossible to fix or ignore issues, any characters or animals on the map slide rather than any kind of movement animation. On top of that, while I can click to move and right-click to open things (door, chest, etc.), no windows pop up for containers and no flower menus pop up for anything, nor do they seem to be working despite the missing graphic.
I'm linking a screenshot of what I see, since it's hard to explain. As far as I can tell, none of the hotkeys, buttons, or invisible buttons work aside from the inventory and (thankfully) the menu. I can log out, but there's no visible indication that I'm doing so until it jumps me back to the login screen. The items in the inventory cannot be moved or interacted with and many of them will appear to be missing, with the items showing up next time I load the game or different ones being invisible in their place.
Hopefully this worked right. http://imgur.com/UHks5bM
Edit: Through repeatedly logging out and back in without closing the client, I seem to have made it work for now. Any clues on to what's happening? It's not my internet connection, since everything else worked perfectly, including other games.