Frustrating upgraded behaviour

[Ambrogio De Lorenzo]

Hi all,
I'm a little frustrated.

In Fedora 20, updated, with the new kernel my udev rule for eth0 is no
more working. Booting with old kernel it's ok. As I have a lot of VM
that point to eth0, I'm booting with the old kernel.
But with the old kernel LibreOffice is hanging on start. It starts only
if I open a File already created.
If I try to open Calc or Writer, it hangs opening it.

The only way is to kill them.

What is appening.

Bye
 Ambrogio