Apply Changes Problem (378.55)

I have been using the Merlin builds for a couple of years on my AC66U without any issue and making minor tweaks to the set-up from time to time; I installed build 378.55 months ago. Recently, I chose to disconnect the internet while doing some PC maintenance and had a very difficult job getting a connection back; the core problem was that any changes that I attempted to make would not "Apply" - including turning the internet back on, loading firmware etc - I just got a spinning wheel for as...

Apply Changes Problem (378.55)