Thanks to everyone for the help and suggestions so far. I've uploaded all the shapefile parts here (sorry, yesterday I was in a rush and I just wasn't thinking):
https://www.dropbox.com/s/ru4s3bi2bt5z4c2/QGIS-merge.zip This file is the result of several "save-as" operations, so the problem outlined by Paolo could be a factor. But I've also tried with the original shape file (which should be "as drawn) and it behaves in exactly the same way. Thanks again, Sarah. 2014/1/16 Tim Sutton <li...@linfiniti.com> > HI Sarah > > Can you post all the parts of the shapefile that others may test (.shp > alone is not enough we need .dbf and .shx too). > > Regards > > Tim >
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