I also encountered errors with network drivers on the new kernels. I was using this rtl88x2bu which broke after the update. I eventually got this one to work, but it threw me for a loop for a while.
I've encountered bugs that broke video or network drivers. Invariably others had reported the bugsby the time I looked them up. I had to stick with an older kernel until a fix was available. With buggyvideo drivers the text console is usually still available to view dmesg for errors.
--
George N. White III
-- Trevor McKay