I'm using TB 102.15.1 on Mac I use TB for work. I have (or had) folders where I keep archives of all work-related emails for all of my clients. I had one folder for each of my clients. After I read emails in my inbox, I move them to the relevant client folder to archive them. These folders have email archives going back for several years. Just now I was reading emails in my inbox, then moving them to folders for archival, by dragging and dropping them into the relevant client folder. I had just finished reading an email and was about to drag/drop it into a folder for archival, and the folders were gone. There was a top-level folder called "Active Projects". There were sub-folders within the "Active Projects" folder - one for each client. Not ALL folders have disappeared. Only the Active Projects folder has disappeared. But,... I alt-clicked on an email in my inbox to get the pop-up window with a bunch of options for things to do with the email. I could select Move To -> Recent -> and the nested window that shows recent folders pops up, and it shows the client folders and I can (apparently) move emails to the client folders. But I can't see the folders. Please help! This is years of work history. Any suggestions for how to get the Active Project folder and all of my client sub-folders to reappear?