I have not had issues with SA boxes, but I have had issues with BEll Expressvu receivers and as well Bose lifestyle headunits. I have tried all of the troubleshooting recommendations. The only way I can get it to work is to use 2 flashers and position them away from the unit, but sometimes it works with flasher installed inside the unit without really trying...weird.

The above mentioned was used with a MRF-250 and MRF-100