The purpose for my posting to your message thread is simply to let you know that you aren't alone with the behavior you've reported.
I am experiencing the same problem with Newsbin, and many other applications including WinRAR, while running under Windows 10 Individual Preview (Currently Build 15048) on my desktop PC (ASUS P8Z77-V LE motherboard). I do not experience this problem when I replace the SDD drive with my system partition for WIndows 10 with one for WIndows 7.
I don't know if it's a bug in Windows 10, or a new feature in Windows 10 for which something needs to be modified in the applications with which I encounter this behavior. As the problem is only a minor annoyance I haven't submitted it as a problem to Microsoft.
I suspect something with the WIndows 10 Windows Explorer involving external USB drives.
MS Windows 10 Pro 64-Bit - ASUS P8Z77-V LE; Intel i7-3770K 3.5 GHz; 16.0GB DDR3; 512MB EVGA GeForce GTX 760; SAMSUNG 850 500GB SATA III SSD; 2 X HGST 3TB 7200RPM 6.0Gb/s SATA III.