Thanks for all the replies so far.
Alt+p just checkmarks the box 'Print to file'.
Loading several different workspaces made no difference.
I've had quirky behaviour with this particular printer before, so I now rather suspect that as the cause, not PSP 8.
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I also tried running PSP 8 in XP compatibility mode. And as Administrator. Neither helped. But unfortunately, having removed both, I'm now plagued by Win 10's pesky message every time I start PSP 8.
It's a frequent issue raised in Win 10 forums. Anyone here using Win 10 encounter it and know a fix please?
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Terry, East Grinstead, UK