I get the same blank screen after saving and rebooting as well as settings appearing to not take effect; sometimes. It can be attributed to two things in my experience. Those being the browser loading from its cache and/or the routers timing countdown being too short.
With wireless N even though it connects at 300Mbit. It seems to equal that of a 10Mbit wired connection or wireless G speeds. I spent a full 8 hour working day verifying it. Wireless N to wireless N, wireless N to wired 10 half/full, 100 half/full, and 1000Mbit. Played around with all the wireless settings including fragmentation threshold beacon period and the like trying to prevent as much extra communication as possible. I will admit that some tests were done in a virtual environment, later finding that vmware throttles connection despite there evassive replys staying that it doesn't. That is when I was seeing only about 3MB speeds. So I moved testing directly to the network with only 1 wired Gb PC and saw speeds increase erratically from 6 to 12 on the top end, but was more stable on the low end if I recall. Windows 7 netmon reported throughout at highest 80MBit but stable around 50 guessing. Its all in another post. But actual tests from network to disk equaled what I stated earlier. As well to mention the upstream is considerably slower than the down stream.
The only thing I can think of is that the 300Mbit connection is just saying that there is 300 available to it but won't utilize it all in one connection. I didn't test simutaneous connections to test that theory though. My other theory is that its wireless switching capability. Remove one antenna and you won't connect at 300Mbit. So in essence its shared bandwidth. That theory is also untested. That's going to be another full work day or maybe half a workday worth of testing.
P.S, I like flakeys.