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 bugs
by the time I looked them up.  I had to stick with an older kernel until a fix was available.    With buggy
video drivers the text console is usually still available to view dmesg for errors. 

--
George N. White III
--
Trevor McKay