The Trash folder in the left frame of my normal Thunderbird screen has disappaered. When I went to my accountsettings of Local Folders and from there to the window Select Local Map/Folder (I use TB in Dutch language), I saw that the Trash folders were disappared as well. I replaced the Trash folders, both the folder Trash.sbd and Trash.mozmsgs and looked what happened. I closed and restarted TB. And yes, the Trash folder was back in mij normal TB screen and I could delete massages again. Even the Junk folder deplaced Junk mail automatically to Trash. After a while (I don't remember if it was after closing and restarting TB) the Trash folder in my normal screen has disappeared again and I couldn't delete messages. I looked in the window Select Local Folder, both Trash folders were in it. I have deleted them and replaced, but TB didn't anything with it this time.