Balance doesn't show up after import in multibit
What version of Multibit and on what platform ie OS?

There were issues with importing Blockchain wallets (a Reddit or BCT thread detailed lost BTC from a supposed lost imported Blockchain private key) so I believe recent Multibit versions have had Blockchain wallet imports disabled.

A couple threads to check:


http://www.reddit.com/r/Bitcoin/comments/1rop3t/bitcoins_showing_up_on_blockchain_but_not_in/
http://www.reddit.com/r/Bitcoin/comments/26fymy/multibit_has_removed_imports_from_blockchaininfo/


There's nothing stopping you from using Blockchain's export unencrypted keys in either base58 or Bitcoin-QT formats and pasting the private keys for import (PRIVKEY will either be 5H,5J,5K or K,L)