I'm running the web app on Safari on OS X Yosemite 10.10.3. I've noticed when extensions are enabled, much of the functionality becomes broken (I can't switch Bible translations, I can't go to various locations, etc.). The extensions I'm using in Safari are: Web of Trust, AdBlock, ClickToFlash, and Amazon. I'm suspecting one or two of them might be interfering with the Logos Web App and I need to whitelist it in the app.