Do print screen of the cursor and post It.
It may be a corruption of the file or something from your PC.
We need more info on this.
Also, did you install / use and visual or graphics mods on FL?
I believe the mods installed are causing this kind of issues. Also the Planets not showing any textures or not loading visual graphics are also texture mods doing.
I don't think you should be using those more detailed texture mods with Discovery.
Try a clean install and don't install any adds and see if there is anything wrong then.
