Open the "Preferences" floater, select the "Network & Web" tab, and look at the "Disk cache path" input box: provided you did not change that setting, it shows a folder which parent contains the 'logs' sub-folder. Of course, to find that hidden folder from the Windoze Explorer, you have to configure the latter to see hidden files and folders.
There have been changes done to reflect the improved land management tools that LL implemented in their viewer, with permanent/temporary bans settings.
My bad: wrong initialization of a flag in the ban duration floater (which causes permanent bans to last for... 0 seconds). To work around that bug (that is now fixed for next releases), simply select the "Temporary" radio button, then back the "Permanent" radio button before clicking "OK" in the "Set ban duration" floater.