Created attachment 1641 [details] screenshot of claws-mail UI illustrating issue With an IMAP folder ("Xdeals") with > 3000 messages, some of the one-line summaries shown do not match actual messages in the folder. This is, to say the least, disconcerting. The attached screenshot illustrates the issue: note that the selected message has 'DC Academic Committee' as subject and is dated 1/2/2014. However, the message shown (after clicking on the 'DC Academic Committee' line in the summary view) is dated 2016 and has the subject "Men's Performance...". Clicking on other messages (only in this folder) produces similar discordant results. If I use mutt to open the 'Xdeals' folder, the 'DC Academic Committee' message isn't even present in the folder (nor are a number of other messages). I encountered this issue with version 3.13.2 (debian 3.13.2-1); the current development (git) version exhibits the same issue.
Go to /Configuration/Preferences/Display/Summaries, and set the 'Open message when selected' option to 'Always'.
(In reply to comment #1) > Go to /Configuration/Preferences/Display/Summaries, and set the 'Open > message when selected' option to 'Always'. Hmmm, perhaps I answered too quickly here...
Right-click the folder, select 'Properties', and then click the 'Discard folder cache' button. It appears that the cache has become corrupted.
Problem solved. I wasn't even aware of the caching mechanism and the ability to discard/refresh the cache.