Recently converted to QGIS 2.18.2 from Mapinfo under Windows10. The Expression Builder in all the menus I've tried fails to display a popup window of values under the 'fields and values' selection when I click or right click on a selected field within the Expression builder window. Doesn't work for either 'top 10 unique values' or 'All unique values'.
However, if I right click a layer in the layers panel and choose 'filter' I can get pick lists for each field. I've uninstalled QGIS, removed all the plugins, re-installed, still no joy.
I figure I'm missing something simple, but have worked through lots of tutorials. Am I missing something obvious?