The issues are continuing to pop up with WebRTC, I don't know how but they seem to be multiplying. Starting just last week, tabs that were using WebRTC (one in Roll20 and one in appear.in, it's also happened while just on appear.in so it's not a Roll20-specific issue) would simultaneously crash completely. Down to the Chrome "something broke" screen, both at the exact same time. Hopefully when the next Chrome patch comes out, it will fix these issues. Until then, if you are having these issues I suggest using Firefox at least until the next Chrome patch drops.