>>At least, we can say it's a bug
>>
>>And it's not only try/catch. I have tried it with the classic on('error') and also with a class with an error function in it (createobject + execute function new_ix)
>>
>>All scenario's had the same result
>
>So Fabio's workaround with FLock() may be the only way around this. Now the question is, will Fox release the lock when the append is finished.

Of course ... NO!