UR 242 vumeter audio always blinking

I’ve recently bought an UR 242, and I think there is a trouble, and I don’t find find what to do.
On the transport toolbarr (in cubase AI), the vumeter of entry signal is still blinking, even when i don’t reccord anithyng.
I try to change the asio settings but nothing change.
My PC is core2 quad, and 3Go RAM with 15000 rpm scsi disk.
the link to the picture of the transport toolbarr
(sorry for my english, I’m french guy!)
Thanks for you help. I can give more details if needed.
transport.png