I'm not sure if it might work but you can try it.
1º- Go to XC folder and delete everything except "x3.xem" and "xnina.xem".
2º- Go to your Logs folder, which should be in "../Alliance of Valiant Arms/AVA/Log" and delete everything.
3º- Go to your config folder, which should be in "../Alliance of Valiant Arms/AVA/avaGame/Config", and open a file named "AVAOptionSettings" (you can also delete it, if you prefer) and scroll down to:
4º- Delete ALL lines that have this format.
5º- Use CCleaner or some other program to clean your PC.
6º- Restart your computer.
Im not sure if that might fix it, but you can try it anyways.