BFGMiner's been giving me issues lately, i've had that happen UNTIL it submits a share... but it's definitly at least 1 share per ant per min so it should show some hash rate...

Been working on an erupter and its now got issues, think I blew the buffer on it as it's acting that way now, the ant is a direct connect so that isn't likely.  If you have a USB camera you could use as a form of microscope ( I managed to find a used one for 10 bux used since they didn't know to pull the cap off the end ) it's darn handy for looking at those SMD parts.  It might be as simple as pull off the heat sink and the pad, put in a toaster oven for 4 min at 200 F and let cool before reaplying the pad then thermal paste then the heat sink.  BTW there are 2 green LEDs at the top corner, they both flash on found shares, lower one flashes on work done, no share.

Edited to add the following
i think my eyes were playing tricks on me, in the dark I only see 1 green flash..... but the other one looked like it flashed.... so which one flashes on the deadish one?

There is dead, then there is dead... If you are using Linux, open a terminal window ( in Ubuntu it's control+alt+T ) and type lsusb with just the 2 assumed dead connected.  Usually you don't get the hubs listed.  If 1 shows, pull 1 and try again to see which shows up.  This will only show the ones that can still ' talk ' on the usb line and not anything else.  With the resistor overclock not even warming it up, it looks alot like SMD rework of the voltage regulator ( U4 by the resistors for the overclocking ) may be bad on them.  The dot indicating pin 1 should be closest to the USB connnector on it ( just in case in mass production on yours they got put in upside down ).  The power regulator is suseptable to transient current when soldering so a grounded tip soldering iron is recomended or hot air work station.  For what little cost those ICs are at places ( Mouser, etc ) it might be worth just checking that they are the correct orientation and no weird burn marks near them.  Also all the pins on my ants for U2 ( the ASIC ) are clean other than the solder and can be read with the USB connector DOWN.  Looking at the board, you will get what I mean.  you haven't said ( and I forgot to ask ) if the red LED goes on when you plug it in.

dumb as it sounds, with both CGMiner and BFGMiner you have to restart the miner for the ' new ' miner to use the clock settings.  I still recommend removing all but the 2 defunct ones from the system and trying just those 2, each on it's own USB chain or on different powered hubs.

I bought a cheap powered hub then found out it has the sideways mounts so I can only fit 4 miners on it AND they have power switches ( nice blue glow to show there is power going to the miners ).  I hit a switch while moving the hub and had to restart as when it re-detected the Ant, it was only getting 1GH/sec until I closed and reopened BFGMiner.  With the other one ' suddenly ' working, I'd definitly look at the cables and see if you can swap USB cables to see if it totaly clears things up.  Been there, Done that, got a USB B cable that only does power that came with a Pic18f4520 board  for powering it, they went cheap and didn't add the other 2 wires IN the cable but didn't remove the connectors at both ends so it looks good on the outside, just can't do more than power things with it.  Just saying, the cables may be adding to the issue.

Good luck with the resistor upgrade.  They DO GET REALLY HOT so, if you have some old/dead ATX power supplies, a drill and a hack saw, there are aluminum heat sinks waiting to get cut down to the right size for Ants...  

Actually we now have 15 available. We will be shipping to customers today / tomorrow and passing on tracking.

Round 3 starting Friday

Are you sure this *just* happened?  difficulty did just increase, yesterday iirc.

M