I can appreciate it may not be ideal to test that out on a live site – and nor am I suggesting you migrate away from that theme, necessarily – but it’s important to discover if the problem stems from a conflict and of course to figure out which component is actually conflicting, otherwise we can only offer up guesses 🙂
Would it be possible to install a fresh copy of WordPress – in a subdirectory, if you don’t have a separate test environment – and test this theory out there? Perhaps by starting with just our plugins and nothing else and then build things up to duplicate your live site (adding your current theme might be the next logical step)?