There's a major glitch with "unread" marking. Version 3.14
I'm sorry for my English in advance.
Okay, to explain it simple, I'll show 2 different sequences to place an "unread" mark.
Sequence 1:
1) Left click on an article, which selects (higlights) it.
2) Right click on the same article to call menu.
3) Select "Mark as unread"
Okay, that works. However...
Sequence 2:
1) Right click on an article WITHOUT selecting/highlighting it with left click first.
2) Select "Mark as unread"
And in this case, sometimes it doesnt work. The feed on the left do show that it contains 1 unred article, but the article itself doesnt change it's status. It happens 80% of the time for me when I follow Sequence 2.