A new version of Lab 1a has been posted with revisions to the "Prep: What do you need to start?" section that add instructions for browser security settings.
Some newer browser versions have tightened security setting defaults that interfere with some Salesforce functions as noted in the Browser Security Settings Advisory posted here on 9/22. Adding these instructions to the 1a cover sheet ("Pre-flight Checklsit) should help prevent these issues from snagging students but please continue to urge them to read the Pre-flight Checklists before every lab and in particular, highlight this browser security setting issue to them at the beginning. Thanks!