Issue with Filter Data Table activity

I encountered this as well where I use a string variable as its value. I still don’t get why it behaves like that when it worked previously. To isolate the case, I dragged one more Filter Data Table and placed a single parameter until I have identified which parameter is problematic. From there I created a DT (data table) variable and assigned DataTable.Select(“[ColumnHere]='” + stringVariable + “'”) - a bit tedious but this worked well with me.