I finally got my Microcell working again last night when I plugged it directly into the cable modem. I let it sit over night, and it was still working this morning. However, when I went back to the configuration I was using prior to Sunday -- when everything worked -- the constant 3G blinking light returned. The configuration that worked prior to Sunday was as follows: cable modem to DIR-655 Router, and DIR-655 router to M-Cell. Now that configuration no longer works.
So, that leaves me with the question of how, exactly, the DIR-655 should be set up for the M-Cell to work properly? As noted, it worked fine prior to Sunday with the current configuration, but won't work now when plugged into the DIR-655. I have tried the recommended configuration settings listed in the manual for the DIR-655 to no avail. AT&T and D-Link don't have a clue.
Thanks for any info on this.