I'm expecting this to be a bug, I've also notice Twitch can take at least 30 seconds (up to a minute) to load a channels information & properly log you into your account through the right-hand navigation bar (the Channel, Video Producer & Dashboard options being grayed out until properly logged in). If I attempt refresh the page while on the Video Manager page, I'll get the "Failed to fetch videos" error:
I'm half-expecting this could be the attacks from iBreezy taking effect, however it could just be another bug with the site (wouldn't be the first time I've run into these types of issues before. Even after logging out & back in, I still got the same issue, so it's not a cookie/session issue... In the mean time any highlights will be uploaded to YouTube to take the place of the broken function on Twitch.
NOTE: Click screenshots for full-sized images
UPDATE: The other thing I'm noticing is that that my avatar is not loading on the top navigation bar, as well as Videos, Followers & Following list are all showing 0:
Every link that should be going to a page on Twitch (Videos, Clips, Collections, Events, Followers, Following, etc.) are giving what appears to be giving the blank bookmark link of https://www.twitch.tv/wondergamer#.
UPDATE: Looking at other channels, this appears to be an issue with ALL channels, not just my own (even tested through my testing account), so I'm pretty certain I'm not the only person running into it, it should (hopefully) be fixed soon...
UPDATE: Looks like the way to fix this issue is to log out, then log back in, you will have to restart your browser to start a new session to have the new cookies take effect (anywhere after logging out). I got this resolved yesterday before I did my stream, however left this here in the mean time as I didn't know if it was going to show itself again, turned out my laptop was having the same issue. I noticed some layout differences after I managed to get the site working again (such as the location of the gear on feed posts), it appears Twitch made some changes to the site & it required a new login cookie, followed by a new browser session to fix it.