Airbrush help

Using a master airbrush g233 and it's been working fine until I put in some Mr.metallic color gx. Sprayed fine. Decided I wanted to do a different color. So I went and cleaned out like I normally do, and now no paint is spraying out. And it's bubbling in the bowl. How else can I clean it? I can't imagine paint dried that fast. Was only using it for about 5 mins.