Bizarre error when saving Data Grid

I’m using Toad 9.7.2.5.

I have a number of tables with columns called TXN_TYPE. If I select data from
these columns, it is displayed correctly.

BUT if I save the Data Grid output (in any format), the contents of TXN_TYPE are
replaced throughout by ‘OODR’.

This doesn’t happen if I give TXN_TYPE a column alias.

Now OODR is a valid value (one of many), so I guess I’ve somehow caused this
behaviour myself - but I can’t figure out how, and it’s v e r y irritating !

Any ideas how I can turn this off ?

Thanks
Jason