Are you absolutely sure you were notified of your roleblock, even if you had no action? If so, that's definitely the exception. You can check from the earliest games of TBT Mafia roleblocks are not automatically notified.
I can't be 100% sure since I had to delete my inbox due to tbt's limits for those who don't have those super mailboxes, but here is the action list from Newbie Mafia II, which Tina hosted and I got a roleblock notification: http://www.belltreeforums.com/showthread.php?195079-TBT-Newbie-Mini-Mafia-II-On-The-Run-(Game-Over-Town-Win)&p=3364405&viewfull=1#post3364405
(Old name is Moron). That being said, it was a jailer. So I dunno. And I think in one of the unofficials I was notified of being roleblocked. Either way I don't have much time left and shouldn't distract myself with this too much.