I keep running into problems with several shortcodes. And, I have yet to get any help or suggestions with the first one I reported. The no-help is expected - it is free afterall. But, the bugginess is frustrating.
Before committing to using this plugin by scattering some of these shortcodes among your website(s)/blog(s), test thoroughly. For each shortcode, presume it does not work until you completely test it. For example, try out "posts" shortcode with the default settings and it will work fine. But, change most anything and it breaks.