Web browsers limit the number of audio playback items that can be embedded on a single page. For instance, Google Chrome will allow no more than six at once. Because of this, if you load a page with more than six Noteflight embedded scores, only six of them will be able to play audio. The first six scores to load will work, but the rest will produce this error message:
We recommend that you avoid embedding more than six Noteflight scores into a single page.
If you happen to run into this error message on a score that is not embedded, (for instance on www.noteflight.com) please try closing any tabs or windows that do contain embedded Noteflight scores, and reload the page on which you received the error message. There is a software bug that causes some web browsers to become confused about which tabs and windows have exceeded the audio playback limit.