USB-UIRT not receiving signals from remote

Everything was working fine until the last few days. Now my Hauupauge remote signals aren't being received. At first I thought I just needed to replace the remote batteries, but the batteries tested good in another remote, new batteries made no difference, and a check with a digital camera showed that the remote was producing signal. I also tried with a second Hauppauge remote, which also emitted signal but had no effect. I'm not getting any red lights on the USB-UIRT panel, and when I use the Sage command to map signals it doesn't see any signals coming in, no matter how close I put the remote to the receiver.
The code-emitting function of the USB-UIRT is working ok, sending appropriate signals to my Comcast DTA via Sage.
Note also that the Hauppauge remotes don't have different modes (TV/VCR/DVD, etc.) that if set in correctly would send signals intended for a different device, so that isn't the problem.
Help!
The code-emitting function of the USB-UIRT is working ok, sending appropriate signals to my Comcast DTA via Sage.
Note also that the Hauppauge remotes don't have different modes (TV/VCR/DVD, etc.) that if set in correctly would send signals intended for a different device, so that isn't the problem.
Help!