kubuntu 15.04
akregator 5.1.3
kde framework 5.18.0
qt 5.5.1 (compiled with 5.5.1)

If in a source I use "unread" filter at first it works.
However if I select first unread article to read it, after my configured delay (1 sec) it is marked as read.
It is then instantly removed (probably this is the fix for bug 117874 "Read articles not instantly removed if filter is set to 'unread'").
The problem is that then next unread article is automatically selected. 
After a second even this article is set to read and disappears and so on.
So after n seconds, all my n articles are marked as read even if I'm still reading first one.

Spectacularly if I set delay to 0, reading first unread article is the same to "mark source as read"

Speaking for myself I would prefer that read articles were not instantly removed if filter is set to 'unread' (old behaviour), since I can see which article I've read in last source.
In any case, after an article is istantly removed, no article should be selected.

Right now I cannot use the filter.