After a reboot (and usually after an OS patch) on our HP-UX 11.23 64-bit Itanium DB servers, our libpq/DBD::Pg libraries cease to work. Instead, they give the standard message you get when the DB cluster is not running. But we *know* it is running and all access paths are working. We have found a workaround by switching from 64-bit perl to 32-bit perl, build a 32-bit pgsql, and rebuild the perl DBD module using 32-bit perl and linking with the 32-bit pgsql. But the fact we're having to do that is a problem for us. I don't understand this problem and am at a loss as to where to look. Any ideas? TIA. Ed