Hello, since one month or so, I noticed the system started creating some new folders in almost all the accounts I have on TB, naming these folders popstate.dat , with different numbers. Some day only one, some day even 20. I noticed it gets worse if I connect via mobile first, and then via PC. Not sure where the problem is, I tried all the solutions I found on internet, but none worked. I also uninstall TB and created fresh accounts. Nothing, nada, rien. It does seem a common problem, which by the way is frustrating and I am now considering to switch to another E-mail client, sadly.