I have a problem with simulink looking like this when I try to use it. It's quite annoying and I don't know what causes it. I'm using it with Linux Mint 14. Have anyone encountered this problem before and found a way to solve it? http://kom.aau.dk/~mnauhe10/simulink_wth.png
Have you tried restarting Simulink? That looks like a typical problem that will be resolved by restaring the program.