Con,
upgraded from 3.6.2 to 3.6.6 two days ago, and have twice run into a new issue.
(5) different machines running 3.6.6 at (3) different physical locations, different carriers.
each miner set up for (6) pool entries, (3) btcguild, (2) eligius, (1) deepbit, set to "failover" mode.
I've now had (2) of them completely stall, no new work.
here's the messages:
[2013-11-01 17:10:07] Accepted 00cdfacd Diff 318/128 BAS 3 pool 0
[2013-11-01 17:10:07] Accepted 01f1c8fc Diff 131/128 BAS 0 pool 0
[2013-11-01 17:10:08] Accepted 01264c88 Diff 222/128 BAS 1 pool 0
[2013-11-01 17:10:09] Network diff set to 391M
[2013-11-01 17:10:19] Waiting for work to be available from pools.
and
[2013-11-02 01:38:48] Accepted 009d365c Diff 416/256 BAS 2 pool 0
[2013-11-02 01:38:59] Accepted 000139c9 Diff 53.5K/256 BAS 2 pool 0
[2013-11-02 01:39:05] Network diff set to 391M
[2013-11-02 01:39:15] Waiting for work to be available from pools.
At that point ALL work in/out of cgminer stops..I get idle miner notifications from btcguild, but it doesn't fail down to eligius or deepbit.
For now I'm going back to 3.6.2, but wanted you to know I'd seen something new. I'm sorry I don't have better logs.