Let me know if this works for you. This bug almost made me give up on the best game in the series.
u/RenaissanceFixer Game: Assassin's Creed: Brotherhood (PC – Steam/Ubi Connect)
After hours of digging through old forums (2011-era Ubi forums are a dark place), I found the fix. It’s not a glitch in the traditional sense—it’s a that Ubi never patched.