Audio looping not working

Example capx below. If you listen to the track in a media player, it loops cleanly, but running it in C2 causes a small gap at the end of each playthrough.

dl.dropboxusercontent.com/u/16469485/Audio%20Error.capx

I tested this in Chrome and it looped fine, but then when I tested it in IE there was a short gap like you said. I'm guessing this is an issue with how different browsers implement audio rather than an issue with Construct itself - have you tried on different browsers?

Not all browsers support seamless looping. AFAIK Chrome definitely does.