LockDown Browser is a custom browser created by Respondus that locks down assessments in Canvas and other learning systems. We support Lockdown Browser only in the context of the University Testing Center, where it is installed on centrally maintained computers in a controlled environment. We are unable to support its use for students' personal computers.
Since the LockDown browser isn't supported in the University outside of specific contexts if a student is having issues with it, it's best to check with Respondus's technical support site. Here are a few common things that come up: