Wiznet W5100 errata

I've been trying to get a reliable network output from an Arduino Ethernet, but I can't get it to stay on line for more than a couple of days. It's not leaking memory, or overrunning the stack, or using all the Wiznet sockets; does anyone know if the current (1.0.5) Arduino libraries include the fixes mentioned in Wiznet W5100 errata sheet version 2.4 dated Oct 28 2013?

I'm not clear on the nature of the errors myself, but they seem fairly basic, and the workarounds are the sort of thing that needs to be built in at the library level.

Thanks for any ideas - Will