Since 2.5 beta, after each upgrade I've been having to re-do the rules for my firewall (Eset Smart Security).
I think that each upgrade is being installed to a slightly different path perhaps? And the firewall sees that as being a unique program and rightly blocks it until a set a rules, which takes a few mouse clicks. I've now got a good number set for the different Muso's:
I imagine there's a way to avoid this within the firewalls setting, but it's not obvious.
It's not too much of a problem for me - but could be for others in the future.