Hi,

Thanks for the CoreDumpDirectory hint.

I was giving a mimimal case that repeatably caused the issue. The original case was caused by trying to disable Apache::DBI whilst upgrading it.

use Apache::DBI;
use CGI qw(-compile);
use XXXX;
[download]

where XXXX.pm has :-

use DBI;
[download]

Hope that clears things up.
UnderMine