Grab a copy of the latest pre release from;-

http://minepeon.com/forums/viewtopic.php?f=3&t=291

Use the default settings, so far I have been able to run 40 (that is all I have) stable.  It will be interesting to see if you can beat my record.

Neil

It worked, Neil. I'm back to 0.2.4 PR2. Many thanks.

I will say I found a key to starting up so many... it takes the USB's (at least the RHB-500) a few seconds to recognize that a computer (in this case the rPi) has been turning on, if I were to let MinePeon boot normally it would only see about 54 erupters (as the other usb hubs are still "turning on" (realizing a computer is there) you can tell this on the RHB-500's due to the nice green indicator light at the front of the hub. So, I delay the miner start up on boot by 20seconds... which corrects the issue and allows for the hubs to "start up" and always boots all 64 without issues if I ever have to reset.

Don't use CGMiner, sorry...

My condolences.

Not as hilarious as using CGMiner and watching it fail to recognize 50% of the miners... 

You need to be using the latest pre-release from;-

http://minepeon.com/forums/viewtopic.php?f=3&t=291

And then on the settings page add a;-

sleep 60 (where 60 is the seconds you want to wait)

After the bit that says "#!/bin/bash" but before the bit that starts you miner.

Neil

8x Erupters per hub, I didn't have much luck when trying to switch them to running off a PSU, I had a cheap 450watt and I hooked up one of the hubs to it, had problems running 6x Erupters... I may try tomorrow with a different PSU, but I'm fine running 8x per, it's been stable over a week this way.

the fans are being powered by a 12v (if memory serves me right it's a 12v 1a, but possibly a 12v 2a) power adapter I converted long ago for another project to a 4-pin molex with a voltage regulator to step down the 12v to a 5v on the 5v output (so it acts as a typical 4-pin molex, 12v (yellow) - ground (black) - ground (black) - 5v (red) ) - which I have going into a 4-pin to 6x 3pin fan split, it seemed to run all the fans at full speed without any problems (versus using a PSU which did the same thing).

Yes it can be done, I was doing it for awhile, just takes some modifying of the Python script.