Thank you, Tim, James and Chris, for your suggestions on solving this problem. In the end it was reimporting the data to a clone that solved the problem. Although rebuilding the file didn't reveal any problems it seems that some corruption must have crept in.

Bruce

On 14/5/2011 01:45 AM, Tim Mansour wrote:

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On 14 May 2011 06:05, Bruce Button <[log in to unmask]> wrote:

I must say I am puzzled. The documented search formats are very handy, but I
can't get them to work!


Does sound puzzling. Have you tried the database on a different
machine (to rule out system format problems?). Or maybe save a clone
and reimport data? Clutching at straws a little...