It's because trading pairs for most alts are to Bitcoin. There aren't many altcoins which have trading pairs to any fiat currencies. If the price of BTC in USD goes down, the price of altcoins in USD goes down. However, this doesn't necessarily mean that the Altcoin price in BTC has gone down, so provided the alt to BTC price hasn't changed, you'll still get the same amount of BTC for your altcoins. Coinmarketcap is just doing an extra conversion of alt->btc->usd, which is why the USD price is actually dropping.

If you sort coinmarketcap by Change (24h) then usually you can see a handful of coins going up even though BTC is going down, which means that not only has the alt-btc price gone up by however much percentage, it has gone up by even more than that due to btc also going down.

I updated my Antminer S1 to the latest firmware from https://github.com/AntMiner/AntGen1/tree/master/firmware (antMiner_openwrt20140207.bin) and now I can't access the Web GUI or ssh. Anyone know how to fix it?

The settings were (ethernet, no wifi):
IP 192.168.2.91
Gateway 192.168.2.1 (this is my home network settings)

Which was mining away happily, until I updated the firmware.

The original settings were:
IP 192.168.1.99
Gateway 192.168.1.1

After updating the firmware and having ticked "Keep settings", waiting about 5 minutes I couldn't connect to the web service. I tried connecting my computer directly through ethernet cable, using both 192.168.2.91 AND 192.168.1.99, and have already tried a factory reset on the control panel (it worked last time I had troubles). I've tried changing my computer's TCP/IP settings to gateway 192.168.1.1 and 192.168.2.1, both of which don't seem to be able to access the web service or ssh. Anybody got any ideas on what to do?

EDIT: I've also tried the advanced IP scanner in the OP, which shows nothing for both 192.168.1.x and 192.168.2.x range.. Uh oh.. :/
EDIT2: I've noticed that there's a Failsafe UI on 192.168.1.1. It's a UI to upload what I assume is a firmware version, but it doesn't seem to do anything after you press submit.