Well that is very interesting (again) because as far as I can see, the well working 3.5.1 wasn't really working well anyway. It was clear a while back that your case was different to aigeezer's but I'm going to go out on a limb here and say that you actually have a hardware problem. The one that fails every single time first up is suspicious, and it seems to create a cascade of other problems.
Hmmm, well I've been running "ymmv" for 5 hours now, and no zombies.... BUT ...
What I find interesting is that there are some TIMEOUTS in the log which look VERY similar to those appearing in the 3.5.1 log - which seems to me to be working well. I don't get any spurious zombies with 3.5.1 and the hash rates all look to be OK, so I don't really "get" the suspected hardware problem. If it keeps running, then surely that's the main criterion? Anyway here's the (ongoing) log from "ymmv". There have been a couple of broadband dropouts during this time which have not caused any ongoing problems, so, "ymmv" has been running very well indeed so far:
https://dl.dropboxusercontent.com/u/44240170/logfile-ymmv-ongoing.txtOf course I'm tempting fate again with this post. But what the heck...
Edit:
I've noticed a small visual bug on some of these later builds. You may be aware of it - it probably results from initial recognition of the devices when the table expands - at the end of the fixed-part of the display, the first line after the dashes is sometimes frozen as here, from 10:52 and doesn't scroll off, whereas the current lines are 16:39 and scrolling, if you see what I mean? Very minor in the grand scheme of things, but you may want to fix it...:
AMU 32: | 335.6M/334.3Mh/s | A:1544 R: 8 HW:59 WU: 4.4/m
AMU 33: | 335.8M/333.9Mh/s | A:1623 R: 0 HW:21 WU: 4.6/m
--------------------------------------------------------------------------------
[2013-11-06 10:52:20] Accepted 02506e24 Diff 111/3 AMU 12 pool 0
[2013-11-06 16:39:08] Accepted 13f26331 Diff 13/8 AMU 1 pool 0
[2013-11-06 16:39:08] Accepted 0a61a71f Diff 25/8 AMU 8 pool 0
Edit: Midnight update: 12 hours and still no zombies. Go ymmv!