Finding a stray transaction

[Grant]

>>>> I'm trying to find the transaction or transactions which are
>>>> preventing one of my gnucash accounts from reconciling.  The latest
>>>> month I'm trying to reconcile checks out itself, so there must be a
>>>> problem in a previous month.  Does anyone have any advice for tracking
>>>> down the problem?
>>>>
>>>> The only thing I can think of is manually un-reconciling each
>>>> transaction in each previous month so I can test re-reconciling each
>>>> month until I find the problem.  That would be an insanely laborious
>>>> process.
>>>
>>> Does the Starting Balance for the latest statement agree with the
>>> starting balance in Gnucash reconcile dialog.  If not then you are
>>> correct, it is a problem with a previous reconcile.  Possibly a
>>> reconciled transaction has been modified after reconcile.
>>>
>>> Colin
>>
>> They do not agree so I think I've got a problem with a previous
>> reconcile.  Do I need to manually un-reconcile each previous
>> transaction one-by-one and re-reconcile each statement?
>
> Another possibility is to go back to your last backup and then work
> forwards from then.
> Or if you feel that you do not need to find exactly what caused the
> problem then you could add a 'phantom' transaction to make the
> reconcile work.
>
> Colin

Thanks guys.  Finally found the problem.

- Grant