Receiver works only in learning mode

Hello,
I've recently bought an USB-UIRT. But its behavior is quite strange:
* In "learning mode" (= learn an IR code in lrnhelper.exe), the USB-UIRT works well, except that the remote must be very close to the UIRT (I think it's normal)
* In "normal mode" (= main window in lrnhelper.exe), the USB-UIRT doesn't react at all. But when my hand / finger is close to the USB-UIRT, it receives some random codes (and light is red blinking) !!
I tried on XP, and Vista (I didn't manage to make it work with Linux).
Please help: I thing my settings are OK...
Cheers
I've recently bought an USB-UIRT. But its behavior is quite strange:
* In "learning mode" (= learn an IR code in lrnhelper.exe), the USB-UIRT works well, except that the remote must be very close to the UIRT (I think it's normal)
* In "normal mode" (= main window in lrnhelper.exe), the USB-UIRT doesn't react at all. But when my hand / finger is close to the USB-UIRT, it receives some random codes (and light is red blinking) !!
I tried on XP, and Vista (I didn't manage to make it work with Linux).
Please help: I thing my settings are OK...
Cheers