Yes It could be your paint is too thick... I use paints that are already thinned down. So they go thrue nice and easy. Also just thinking out loud here but what PSI is your compressor set at? Single action or double action brush? What kind of paint? Also if you ran thicker paint through there it could have plugged something up?
"suppose you were an idiot; and suppose you were a member of congress, But I repeat myself".- Mark Twain
"Go to heaven for the climate , go to hell for the company".- Mark Twain