Strange nanoBTS Behavior

Dear List, I'm a long time listener, first time caller - but have been enjoying experimenting with OpenBSC for a little while now. I've come across a new (to me) nanoBTS with some strange behavior: it seems to come up normally and pull an IP over DHCP, and interacts as expected with the ipaccess-find and ipaccess-config tools, but *never* attempts to establish an OML link. After provisioning the correct settings with ipaccess-config, the unit reboots and slow-flashes the orange light (no OML) and there is *no* network traffic initiated by the nanoBTS past the DHCP exchange; however, I can ping the unit using ipaccess-find and ping. After running a reset with the dongle and a repeat of the above, I get the same results. Any ideas? Thank You, -MM