Sure, I uploaded a version with the bug to this URL: http://www.ekb-kochen.de/temp/
In order to reproduce the bug, I generated an arbitrary juicebox using Juicebox Lite 1.3.0. Then, I set the font-family css property in line 18 of index.html:
* { font-family: Arial, Helvetica, sans-serif }
As a result, the left/right arrows do not show properly anymore. Browsers used: Firefox 20.0.1, Chrome Version 26.0.1410.64 m, and Opera 12.15. By the way, the three browsers all show different characters for the left/right buttons, but all are wrong. The bug can be fixed as described in my earlier post.
If you still cannot reproduce it and cannot see the error in the posed example juicebox, I can supply screenshots of the error on your request.
Best regards!