Access Level not working

WordPress Version: 4.1.1
SAM Version: 2.5.94
SAM DB Version: 2.8
PHP Version: 5.4.38-nmm1
MySQL Version: 5.5.40-nmm1-log
Memory Limit: 256M

Under “Minimum Level for access to menu” I have white field, cannot change anything 🙁 By the way really good plugin.

https://ww.wp.xz.cn/plugins/simple-ads-manager/