Thanks for all the comments. If anyone is still experiencing this issue after upgrading to the latest version of Chrome, I want to know about it! Feel free to send me an email at email@example.com
Our team experienced this (HTML Source Editor being blank), and solved it by clearing our browsing data. I can't speak to needing to upgrade Chrome and that being the source of problems, but I'd try clearing out the cache/browser data in addition to anything else you're trying.
I'm using a Mac and Chrome 43.0.2357.81, but the rest of my team uses Windows PCs.
Since clearing our caches, none of us have had this issue (thankfully).