Site to site vpn between two 5510 ASAs, tunnel up, no traffic passing

[ddunk0077]

I have two sites, both have 5510s with a site to site tunnel in place. Everything was working last week, come in today and no one can reach each other. but i see the tunnel up with one side passing traffic and the other side is not. I reloaded both ASAs, cleared tunnels and nothing, still the same. Does any one have any ideas?

[andrew.prince]

You should check your routing/no-nat and change log, has anything changed since the last time it was working?

Post your config from both ends for review - remove sensitive information.