Table structure:-
CREATE TABLE IF NOT EXISTS testblob (
id int(11) NOT NULL,
name varchar(56) NOT NULL,
image blob NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Found it working fine in 3.5.4. Also, MIME transformations work fine in latest_git too but not upload.
Javascript cannot read local files for security reasons, so we can't send the data using AJAX. So I think we have to disable ajax for insert forms which has 'blob' fields.
I have created a bug fix for this error
https://github.com/phpmyadmin/phpmyadmin/pull/174
Fixed in master with pull request 174.