[Robert Crossley] There are a couple of tricks that I have used when
getting overlay errors that may help. Sometimes these are caused by
duplicate nodes in polygons, and you can fix these by overlaying the
polygon on itself. i.e. selecting all objects in a layer, set target on,
select all objects in the same layer and choose objects > overlay nodes.
I have also found that overlaying nodes may also help before splitting a
layers with another, i.e. selecting all objects in a layer, set target on,
select all objects in the layer that you wish to split with later and
choose objects > overlay nodes.
Another is to convert all regions to polylines, then back to regions. This
recreates the centroid location.
There are no guarantees, but these are tricks I've used to force MapInfo to
rebuild the regions in the hope of getting rid of some of the errors.
These mainly worked on regions that had been created using MapBasic
routines, however, but maybe the shape file to MapInfo ported some similar
types of errors?
I think Jacques' answer of finding a copy of 5.5 would be a better
solution.
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