We’re sorry people are experiencing issues here. We have gone back to the old behavior for the left-hand folder tree to always show since last year and we hope this has addressed most issues.
There are some reports in the comments about individual folders not showing up. In order for us to get to the bottom of the issue, please post as much detail as possible in your comments. What steps are you taking? Which browser/computer/operating system are you using?
Thank you for your help.