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