I upgraded from KDE 4.24 to 4.31 and upgraded my kernels .
After rebooting, most of my GRUB entries would not start my system, while only one did (the but even though the YAST partitioner says /dev/sdb1 is 2GB (/dev/sdb1 is mounted on /opt), a df -h says that /opt is 61MB!
So everything that was on /opt is gone: no more k3b, no more Google Earth, and Open Office crashes everytime I ask it to save!