Hey there, I noticed after long peiods of use (or rather having Vox open in the background) it stops detecting microphone activity. I keep Vox in standby mode usually in the background incase I want to launch music without clicking Media Monkey, etc.
I also noticed if it does pick up my voice, it tends to not understand what I say a lot of the time or I need to yell for it to. Again this is after extended periods of use. If I restart Vox it works flawlessly.
Using Windows 7 Ultimate 64-Bit and Vox version 0.939.
Also have a Turtle Beach Earforce X12 headset if you're curious.
If you need more information let me know and I'll get it for you.