Were you ever able to resolve this problem? I am running into the same problem with Asus Merlin 384.10_2. To make a long story short I tried resetting the router, downgrading first to 384.5 (not working) and then to 384.4 (still not working). What seemed to fix this was loading the stock Asus firmware and then after setting that up revert back to 384.10_2. I have no idea what the cause of this error is and any info (should this ever happen in the future) would be useful.
I fixed the issue entirely by turning off these 3 options in Administration / System:
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