The heat is normal when using the wi-fi.
I have some black screen issues also, and restarting fixes it. But I found a quicker way. I use the Dock sunburst to access any of the apps that effect the main menu. DockSwap, rSBT, SMBprefs. The apps restart when you make a change, which also brings your icons back.
I just figure it is one of the draw backs of modding.