I've just used the site search facility and came up with loads of people who've had problems with their Badger 200's, but none like this.   If I use pure water or neat thinners it sprays just the way it's supposed to. However, adding the tiniest amount of paint (Ten-to-one?) means it stops spraying and air starts bubbling up through the paint container.  Acting on a hunch, I tried unscrewing the metering needle.  Sometimes it didn't make the slightest difference, even if I unscrewed it compl