Quick UPdate for you:
ChromeBook Operating Systems: are going to be updated TODAY to v53. If a student is having any inexplicable problem today accessing a site, check for this in the bottom / side status bar.
Student can click the icon, log back in, and they will begin running the new operating system. If they update and STILL have trouble accessing a site please let me know the name of the site / application ASAP and I’ll try to troubleshoot. There are always a couple of glitches that we find after we get into it.
You shouldn't really have any issues but I wanted you to be in the know, have an idea for troubleshooting, and have a life line if your lesson is impacted.