After submitting a ticket and getting a reply form Ry, The problem arouse from the java client. It is a problem with the java version (it will be fixed for all version later).
One suggested solution is the following: (For windows):
1- Open your windows notepad.
2- Type the following
javaw -Dsun.java2d.uiScale=1 -jar RuneWild.jar
3- Save as the file like the following below on the same place Runewild.jar is located at:
4- Now you can play Runewild with OpenGL normally by clicking the new created file:
