Ground Partially Missing & Skipping

Hello, all.

I haven't played DST for some time, and recently, I've started playing it with my sister again. We are in two different cities. When I host the server, I have no glitches, but she continues to get errors that do not allow her to join my server. But when she hosts a server, the ground textures are partially loaded and I cannot walk where they don't exist. Even worse, in some places where they do exist, my character keeps jumping about. This is especially frustrating as it limits me to a very small portion of the board (no more than 4 diamonds away from the spawning point.

Other important considerations where these issues (the missing ground, the glitching character, or her unable to join my server):

• I have searched the net for this same issue, only to find that the provided solutions did not work.
• Both of us have fully updated games with no mods installed.
• We have both tried hosting password protected and non-password protected servers.
• We have tried a smaller board (sometimes none of the ground loads with these).
• I have rebooted my computer.
• I have tried uninstaling and reinstalling the game. 
• I have tried running Steam and DST as admin (both together and both individually).
• I have verified the integrity of the game files. 

Any help would be greatly appreciated.