After just about giving up I reset the nvram with the command : mtd-erase2 nvram and the RT-AC68U seems to be working very well! Thanks Eric!!!
Update: Seems that I "spoke" too soon. After I erased the nvram, restarted the router and went through the setup it did seem to be working well. Until... I power cycled it. The LED's came on but I had no WIFI, LAN or WAN. Another power cycle with the WPS button pushed. Nothing... pressed the reset button... nothing. Finally powered up into recovery mode and installed .376.1663, factory reset, installed the .376.1663 again from the firmware update, factory reset again, configured the router and let it update itself to .376.3626. Power cycled a couple more time then installed Merlin .376.48_5, another factory reset, configured the router, several power cycles/reboots and it is working!
Not sure what is up with the 378.50 Merlin build but it just will not work for me! The .376.49_5 has the features I need so I may just stay with it. Suggestions?
Bill