Lockdown App Problem

Hello folks.

I hope someone here can help me.
I have some issue with the Lockdown APP (installed via cydia).

According to Cydia, it is Version 6.2

Now, I had my phone jailbroken for a while, so probably I had a previous version installed and sometime in the past updated, not that I could remember when and from what version, but my issues are these:

When I try to run the lockdown app, it just crashes with no further ado back to springboard.
When I uninstall lockdown and reinstall it, nothing changes.
When I uninstall it, obviously apps are unlocked, but after reinstallation of the app (without once again configuring it), the old apps are protected by the old password again.

Now, does anyone know a reason why it might be crashing (6.2 on 3.1.3 (but it crashed on 3.1.2, too)) and how to fix it?

Or can anyone point out a way in which to remove the app so that nothing remains of it? Do I have to restore for that?