Hello, it's me again. It's a bit quiet round here at the moment, I don't know what has happened to Mr Patterson. Also people are less likely to answer if you don't mark any of your replies as useful or correct.
Anyway, the plugins that are not working have a separate ui component. These are in a separate folder, e.g. the SnippetRunner sample has the SnippetRunner folder containing the code to build the binary plugin and a SnippetRunnerUI folder for the ui component. The CC SDK includes the built installer for the ui components. These are zxp files that you install using the Adobe Extension Manager. I think the 2014 SDK only includes the source so you have to build it with Flash Builder (or just get the built versions from the CC SDK).