I haven't logged on to Fedora for a few days, but I did this morning and opened claws mail and clicked 'get mail' and it proceeded to download new messages. However, when I clicked on the inbox folder, the email count changed to zero! No email.
I checked and found the folderlist.xml has the correct Mail folder location, and when I went to that location, (on a shared data partition) indeed the 'inbox' folder was EMPTY. No files at all. I'd had a similar issue once, but the email #MH location wasn't correct, so when I fixed it, the email appeared. I did a web search and a search of the claws bugzilla, and the closest I came was a message about the cache not keeping accurate information. There was a claws-mail update at the end of May, but it had been working fine since then up until now.
And, it's possible it's some sort of Fedora issue (?), because I had opened my 'home' folder on my desktop to check the claws folder, and now I see that there's a gaping hole on my desktop where that folder should be. I can get there by clicking 'places' and 'Home Folder'.
Any ideas? Any other reports of disappearing folders and email?