This is something you should have seen dating back to Windows 1.0 (or for those that used DesqView, you could see this there.)
Nothing's wrong. It's how it works. As to Windows 7, it happened there as well so anyone's guess how your prior machine differed.
Need to deep dive why Microsoft did that? Read http://blogs.msdn.com/b/oldnewthing/archive/2011/12/26/10251026.aspx
Bob
Hi, quite a trivial question, i know, but it's bugging me and i'm hoping someone can help please
I use .bat files and rtmpdump to record some webstreams, and since i changed to windows 8.1, the "size" of the active recordings stay at 0kb, even though they are actively collecting data. Before on windows 7 i could right click in the folder and click refresh and the "size" would update to what it is currently at while it's still recording, as seen here for the .flv file:
http://thumbnails109.imagebam.com/37981/cdd428379802929.jpg
When i close the command to end the recording, the file size shows but only then. Can anyone tell me how to fix this please so that it shows how big the file is when i refresh the folder? thanks

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic