grep LOADER_TYPE /etc/sysconfig/bootloader
LOADER_TYPE="grub2"
I also checked zyppers log history files. The date the update was done was the January the 3rd:
grep --line-number '2016-01-03' /var/log/zypp/history
2016-01-03 18:59:45|install|k3b|2.0.80+git20160102.1831-2.1|x86_64|root@linux-kw7v.site|packman_opensuse_13.1|d4f4c00b4cde6e990685f86926197eccfdd245536f8947192e5bb67371c899d5|
2016-01-03 18:59:47|install|k3b-lang|2.0.80+git20160102.1831-2.1|noarch|root@linux-kw7v.site|packman_opensuse_13.1|a24cb23e4d1bc0a00955e638d0d8d78c5a0f940354422a8c04570cae9563d65d|
2016-01-03 18:59:47|install|k3b-codecs|2.0.80+git20160102.1831-2.1|x86_64|root@linux-kw7v.site|packman_opensuse_13.1|1a9bdb90a5ab4c077ba1fb752b542876f0b14adec5dd7ca9994893e0c6983c58|
2016-01-03 18:59:49|install|grub2|2.02~beta2-20.14.2|x86_64||repo-update|300bcfc02d5f99e5fb51c5eb43c7d8bfe67823c2586a9ecd479b99d69e81da68|
So I guess the update to grub2 to 2.02~beta2-20.14.2 may have issued the problems.