(ok 2.10.0.3) Blobs being cleared on Edit of row

Apache/2.0.52 (CentOS)
PHP Version 5.2.1
MySQL 5.0.22

When editing a row which contains longblob fields, they are cleared. Rather than being left as they were.

This behaviour is difference to phpmyadmin version 2.9.0.1

We have a table containing 3 fields (id INT(10) unsigned auto-inc, title VARCHAR(64), image LONGBLOB)
This has been populated from a php script on our website.

If we edit a title using phpmyadmin 2.10.0.2, then the blob gets cleared to 0b. The SQL appears to be UPDATE tbl SET title='newtitle', image='' WHERE id=1. When in 2.9.0.1 it would have not included the image='' in the query.