Same here but crashes on first(and all subsequent) executions from app folder, also on 10.6.8
I believe I know the issue and it is this:
std::string CMessageHeader::GetCommand() const
{
return std::string(pchCommand, pchCommand + strnlen(pchCommand, COMMAND_SIZE));
}
I will look to fix/hack/workaround this and provide a working DMG for you guys on 10.6.8

Bitcoin Core 0.11 dropped support for 10.6.8 (didn't really announce it as far as I know).