Kmaill Version 5.1.2 and "empty" folders

Hi 

Anybody else getting the situation where you can click on a fold with unread 
emails and kmail does not display any emails in that folder.  I've been having 
it on random folders but the data does eventually get displayed.

Regards

Ian

Using:
KDE Frameworks 5.19.0
Qt 5.5.1 (built against 5.5.1)
The xcb windowing system
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