I imported an mbox file with about 800 messages.
As target folder I selected LocalFolders/inbox.
The import created a new subdir "MBOX-xxxx" and the message list shows all messages (subject, date, sender, ...), also the folder tree shows the number of unread messages - however clicking on any mail does not show the content.
Double clicking does also not open a new window with the mail body.
CPU is zero.
There is no indication whatsoever why it fails to display.
Restarting kmail does not help.
Selecting "Update Folder" does not help.
Folder Properties/Maintenance shows "indexing enabled; Folder was indexed: <today>"
 Restarting akonadi (akonadictl stop ... start) changes the behaviour: I can now click on a message and get a short flicker in the message body area but still see no content. However pressing "V" gives me a new window which shows the message content.
Also double-clicking a mail now opens a new window but only shows the headers but no content.



Reproducible: Always