Hello,
I want to report that sometimes feeds in my list are not marked as read while i am going over. Refreshing page solves this issue for a while but after sometime it happens again. So I need to refresh page periodically. My feeds contain various types of content like text, image and flash. (flash objects are not shown but i didn’t take it as a problem 
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Do you mean the stories as you scroll over them? Are you in the Feed view, and are you using the River of News (reading a Folder/Everything vs. a single site)?
Yes, I mean scrolling over stories. And I am in feed view and viewing a single site’s feeds.
It happens after you’re some 40-50+ stories down, right? I’ve noticed it, too. I have no idea why it’s happening, especially since it used to happen far more frequently and I already fixed it. I’ll have to perform a lot more testing, but it’s not something that is easily reproducible. I’m hoping to spot the bug and take it out at the knees, but that’s easier said than done. I am at least aware of the exact issue.
So you could reproduce it, too. It’s nice, this was what I’m worried about 
OK, I’ll inform you in case I notice some new tips that may help you to smash the bug