I find that sometimes when I open my project all the compile and build options are greyed out. This has also happened a few times after doing a build. The only way to get it sorted is to exit the program and hope it is fixed when I re-launch.
Another issue I have is that I made the background color of the editor black. I adjusted all the other colors but noticed that certain things have a foreground color of black too making them invisible. For example if you use a variable that has not been defined yet then it is black - invisible. The include statements between <> are also black.