About the history problem you are facing, are you sure is just the history, or things like changed settings not saved, software does not disable itself after closing the app...
This is a database problem, probably because the update has been done with the iBlacklist enabled, or a rebbot wasn´t performed after the update.
Anyway, a complete fresh installation shall always work.
As you already noticed, when installing/updating/uninstalling iBlacklist, a reboot is a MUST, and a popup on installer is opened to inform this to you.
So, to install from scratch, just uninstall, reboot, reinstall from
http://repo.iphonebrasil.org/ , and reboot
Then it will be fine.
About the hang up while the phone is on your pocket, this could happen, but there will be an option to setup the softwares sensitivity, so by raising sensitivity, the call can be disconnected by shaking/fliping the phone and by lowering the sensitivity the software will only hang up calls by fliping the face down.