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Desktop, with Atom processor; Canon pixma iP2850, only a couple of months old. As I said, it's only this one document that is the problem. Re the 'crash', perhaps I've used the wrong word; everything freezes, the cursor won't work, I can't go back to a previous screen or shut down normally - the only way is to switch off and then on again. Haven't tried it again today as i've been working on it, but will have another go soon, now that the '1 detected object' has been quarantined. Even if it works, I'd be interested to know how it happened.