This is certainly the case on iOS devices (and is documented in the description for playAudioOnLoad on the Config Options page) but I do not know if this is also true for Android devices (and you should not need to click the Audio Button twice). It sounds like your gallery's Audio Button may initially be displaying the 'pause' symbol (implying that the audio is playing when it is not) but then you have to click the button (to display the 'play' symbol) and then click the button once again. Is this correct?

Please make sure that you are using the latest version of Juicebox-Pro (v1.3.3) to ensure that any bugs that were present in previous versions but which have since been fixed are not contributing to your problem.
Instructions for upgrading Juicebox-Pro can be found here.

If you continue to experience difficulties, please let me know what device/browser you see this problem in and please post the URL to your gallery so that we can investigate further. Thank you.

Thank you for providing the URL to your gallery.
It's just a thought but try removing the & character from your gallery's URL to see if this makes a difference.
The & character is reserved (as a delimiter for a query string) and may be causing a problem in certain browsers when resolving the URL for your audio file.
It may be unlikely to help but no one else has reported the problem you are describing so it might be worth trying.

Also, does the same problem occur in this test gallery?
http://www.juicebox.net/demos/pro/full/ … nLoad=true

Thank you for testing the link I posted.
I have notified the developers of this issue and they will investigate further.

@aleckaram

Please post the URL to your gallery so that I can take a look.
Also, please let me know exactly which devices and browsers (and version numbers) you use.

Also, please bear in mind that playAudioOnLoad (the ability to start playing audio automatically when the gallery is loaded) is not supported on iOS devices.
(This is noted in the description of the playAudioOnLoad configuration option on the Config Options page.)

Thank you.

At the moment, your web page is not loading for me at all. I have tried a couple of different browsers and the little icons in the browser tabs just keep spinning. I will try to view your gallery later. Once I can view your gallery, I might have a better idea as to the cause of your problem.

Please make sure that you are viewing your gallery using a wi-fi connection rather than 3G. Viewing a gallery using a 3G connection can break Juicebox if your provider uses content modification. If you are using a 3G connection, then please see this FAQ which provides a solution to the problem:
Why can't I view my gallery on a 3G mobile connection?

Thank you for the information.

I have now been able to take a look at your gallery and the configuration options it uses (although I do not have a Samsung S3 on which to test).

Is the audio icon's status always correct, though? When you load the gallery, does the audio icon in the button bar show the 'Click to play audio' status and does a single click (rather than a double-click) play the audio? It sounds like your stock Android browser does not support playAudioOnLoad (like iOS devices) but that the Audio Button is displaying and functioning correctly.
Try a difference browser (such as Chrome) to see if this makes a difference.
Also, try setting expandInNewPage="AUTO" or expandInNewPage="TRUE" (rather than expandInNewPage="FALSE") to expand the gallery on a new page (rather than within the embedding page) to see if this makes a difference.

Maybe this is due do with the fact that your audio tracks are approximately 7MB each and are taking longer to download over 3G. Does the gallery display OK over your 3G connection? If not, please see this FAQ for a solution.

I also notice that your gallery's Back Button icon is not visible.
The Back Button icon's color should be determined by the buttonBarIconColor but is overridden by the textColor (which in your gallery is fully transparent). Either change your gallery's textColor (so that it is not fully transparent) or remove this configuration option from your gallery's XML file and your gallery's Back Button icon should become visible.
(I have logged a bug report with the developers regarding this and it should hopefully be fixed in a future version.)

So the problem appears to be that audio does not play on load in the stock browser on a Samsung S3 running Android 4.3 (but that the functionality and icon status of the Audio Button is OK).

Unfortunately, this may be unavoidable (similar to iOS devices) and that the user will have to click the Audio Button to start the audio playing.

Have you tried a different browser (such as Chrome) yet to see if this makes a difference?