I have searched the forum for "unread" in order to make sure I am not repeating a previous post, and didn't find anything applicable. Sorry, if I missed something.
I have moved from 10 years of Eudora usage to PTB on a USB flash drive and love it. There is just one single issue, which I encountered. Every time I use PTB on a computer I never used it before, almost all mailboxes and all messages therein will be marked as unread again. The Shift-Ctrl-C command only works on folders without subfolders. Thus, it is rather painstaking to set all messages to read again.
Is there a way to stop this (the resetting to unread) from happening in the future?