Noticed this in my console after browsing around for a while:
Uncaught Error: JX.$('inline-comment-preview') call matched no nodes.JX.$E @ core.pkg.js:2 JX.$ @ core.pkg.js:276 updateLinks @ differential.pkg.js:69 JX.install.statics.pass @ core.pkg.js:147 JX.install.statics._dispatchProxy @ core.pkg.js:142 JX.install.statics.invoke @ core.pkg.js:89 JX.install.members._onchangesetresponse @ differential.pkg.js:411 JX.install.members._onresponse @ differential.pkg.js:408 JX.install.members._onload @ core.pkg.js:408 (anonymous function) @ core.pkg.js:69 JX.install.statics.pass @ core.pkg.js:147 JX.install.statics._dispatchProxy @ core.pkg.js:142 JX.install.statics.invoke @ core.pkg.js:89 proto.invoke @ core.pkg.js:67 JX.install.members._done @ core.pkg.js:226 (anonymous function) @ core.pkg.js:230 JX.install.members._handleResponse @ core.pkg.js:230 JX.install.members._onreadystatechange @ core.pkg.js:214