[opensuse] oss 11.3 kernel update crashes initrd and bootloader

hi, everytime i install a kernel update (yast | online update) my system doesn't boot anymore. i found out that the initrd-disk is missing and the grub boot menu (menu.lst) is missing all of its entries. today once more i did a kernel update but i did not reboot - i will do in the evening. so i looked at /boot and the initrd is missing and the grub menu.lst is broken too. so i fixed both and hope the system will boot normaly. has anyone else experienced this strange behaviour? best, johannes