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The query results from a vector filter seem to toggle between viewing the original data set and then the subset from the first query. I am using this to tweak the positions of labels. (seems awkward..)

Confused?

Let me try again.

0) build a filtered layer, copy this layer to a new layer. (maybe the problem starts here)

1) build a query layer by selecting some points in dataset, say
"UA-ID" = 'OT-11' OR "UA-ID" = 'OT-14'

2) later alter this query to be:
"UA-ID" = 'OT-11' OR "UA-ID" = 'OT-14' OR "UA-ID" = 'OT-13'

3) test the query
The test returns "the where clause found 2 rows"

4) clear the query

5) test the query
The test returns "the where clause found 3 rows", even though the query box is now empty.

And, now, whilst trying to reproduce this problem I seem to have loaded garbage into the point shape file. It appears that label placement settings are displaying the wrong attribute/field. The file does not seem to be corrupted