HTML5 presentation interrupted with “Loading…” overlay; never recovers

I’ve uploaded an HTML5 presentation to my web server, but the playback is very unreliable.  Usually the first half will play correctly, but about halfway through, the audio stops playing and a gray “Loading…” overlay appears.  The project is then effectively dead in the water with futher audio problems even on a refresh. What causes the Loading overlay?  My audio files are under 1MB in size and there’s no reasonable lag in my network connection.

Can’t make simple “AND” conditional work (Captivate 9)

Advanced Action conditional fails for “All conditions are true”