So it seems like the default drilldown from your dashboard table is not passing the whole query/correct query to flashtimeline, so you are getting no data. you might have a Redirector module within your table module. you can configure it to pass the exact query that you want to pass in the arg.q parameter. You can customize it with the row/field user clicked.
<module name="Redirector">
<param name="popup">True</param>
<param name="url">flashtimeline</param>
<param name="arg.earliest">$search.timeRange.earliest$</param>
<param name="arg.latest">$search.timeRange.latest$</param>
<param name="arg.q">search index=$index$ sourcetype="$sourcetype$" source="$source$" $click.fields.Field Name$</param>
</module>
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