Send shared seems broken with Blockchain.info. I'm sure piuk will fix it eventually.
Why would you use a wallet that destroys your privacy in the first place (change address reuse) and then sells it back to you for 0.5%? Some web wallets are ethical and offer you free mixing right off the bat.

Well this is a pretty sick bug then! I will open a topic about my case as soon as I'm able to post, I did some testing and 50% of my 8 shared send transactions did not came through, but the money did arrived at someone else! For now piuk owns me more then $600.
Can you tell me about those web wallets, do you use them? No unreliable ones please.
This is not a good news. Does that mean we cannot trust them with shared send?