I'm using 3 Asus RT-N66U routers with tomato-K26USB-1.28.0495.1MIPSR2-Toastman-RT-N-Ext. I found after setting up the B/W Limiter GUI to my liking the router goes into a reboot loop. The only thing that can rescue it is putting it into recovery mode and reflashing Tomato using the Asus utility. Interestingly, the reflashed router works fine even though the pre-reboot-loop configuration is still present (i.e. the B/W Limiter is still enabled... disabling it does not cause a reboot loop). I can consistently recreate this scenario on all 3 routers but I do not know what other information is needed to diagnose this further.