Did you change the DBProvider app setting to point to the SQLClient provider?
See http://squiggle.codeplex.com/SourceControl/latest#Squiggle.UI/app.config
Look for DbProvider key in appSettings
See http://squiggle.codeplex.com/SourceControl/latest#Squiggle.UI/app.config
Look for DbProvider key in appSettings
<appSettings>
<add key="DbProvider" value="System.Data.SQLite.EF6" />