I actually managed to get it working last night! Basically I just had to redownload and replace the terrains folder, hopefully i wont have anymore problems!
Edit: So just tried logging in for the first time today and the problem is reoccurring, I repeated everything I did last night: Sending the character home via user panel and re-entering The Grounds from Lonely Cave (failed), replaced the terrains folder (failed) and i changed my rendering system to Direct3DX9 and that did not work either... I then tried to uninstall it as you said and then tried to reinstall it, but it said that a newer version was already installed onto my computer and that no further installation was necessary..Im not sure if I uninstalled it correctly or not cause im not sure how to exactly..XD
I am at such a loss..Ill continue looking through the main directory and subfolders, making sure there are no duplicates, if I get it working again ill re-edit this message.
Edit 2: Well...*knocks on wood* I think I finally have got it working..This is the third time I've logged in today and the last two times it has yet to crash, keeping my fingers crossed..
All i had to do was reinstall the game entirely and then I slowly started to add my stuff back (interface, fur textures, animations) I have yet to re-add my podium, screenshots and presets, kinda scared to do anything rn XD