Specifically, once I get the WCAG Anaylsis warnings for a website into my warnings window I can't get rid of them, until I close down studio. When building another project in the same solution they stay there.
Anyone got any ideas?
I came across this question yesterday looking for an easy answer. While closing the solution works for me, and then rebuilding only the solution I want to see warnings on, I found that doing a "Clean Solution" (right-click solution, select "Clean Solution") will clear the Error List pane (including warnings).