Errors sending Blob to DB

I am using Delphi7 and PostgeSQL 7.3

My DB table is as such
Create Table files (
emalid varchar(80),
memocolumn text,
savedfile OID );

I cannot post Blobs to the DB that are larger than a typical icon. If the Blob is small, it goes through just fine. When I try to send a larger object to the DB, I get a Postgres error:

SQL Error: pqReadData() - read() failed: errno=0

What am I doing wrong with this and what can I change to eliminate the error and get larger files into the database?

Thank you,
Derrick