すでにMT-Blacklist 2.0eを利用していて、MT3.1xのアップデートに伴い、MT-Blacklist 2.01bへアップデートする場合はいくつか注意が必要です。
MT-Blacklist > installed but won't activateI finally figured out that my problem was duplicate rows in the mt_plugindata table. They must have gotten created when I was trying on of my reinstalls. This time I went in and removed all tables, files, and those rows in mt_plugindata, re-up'ed everything and got it working right off the bat.