I am not sure if pagelime supports passing content to asp.net masterpages just yet. Right now anytime I make a change and publish the website it does not update the masterpage section.
Reading your server side includes post on your blog you don't say specifically that you support masterpages but there is a comment thanking you for creating support for masterpages?
So I'm just looking for some clarification on whether you support them yet or if you don't, when you will! =D