Same issue..
Every time I update and use ANY server besides Safer networking #1 I get bad check sums. Even with SAfer Networking #2 or #3.
Is it really overloaded servers or something on My end over here. I can't imagine every other server being too loaded, and I COULD just select #1 all the time, but I'd like to spread the bandwidth around a bit and not always hit the home servers. Bandwidth cost $$ , right?