QSqlQueryModel::setQuery - SIGSEGV

[onamatic]

I'm using Linux / Qt 4.5.0.

Most sql work is going fine except for this piece of code where I'm using QSqlQueryModel for the first time:

QSqlQuery query("SELECT name FROM videosource ");
QSqlQueryModel *model = new QSqlQueryModel;
model->setQuery(query);

QSqlQuery query("SELECT name FROM videosource ");
QSqlQueryModel *model = new QSqlQueryModel;
model->setQuery(query);

To copy to clipboard, switch view to plain text mode 

model->setQuery(query) blows out; top of stack is:

Thread [1] (Suspended: Signal 'SIGSEGV' received. Description: Segmentation fault.)
36 mysql_stmt_num_rows() 0x046afaa7
35 QSqlQuery::size() /media/OneTouch4-Main/internet/downloads/QT4.5Preview/qt-x11-opensource-src-4.5.0-snapshot-20081217/src/sql/kernel/qsqlquery.cpp:717 0x00232cfd
34 QSqlQueryModel::setQuery() /media/OneTouch4-Main/internet/downloads/QT4.5Preview/qt-x11-opensource-src-4.5.0-snapshot-20081217/src/sql/models/qsqlquerymodel.cpp:347 0x00246acf
...

mysql_stmt_num_rows() is presumably in a mysql library somewhere so I'm guessing there is an issue between QSql and mysql.

(The query "SELECT name FROM videosource" works fine in other situations.)

Anyone seen this kind of problem before?