In mashup I have bind a infoTable to a grid and checked the IsEditable property of the grid. In the Configure Grid Column I have also checked the Editable in Cell Editing Options. But when I view the mashup I am not able to edit the grid. Like to mention my Thingworx version is 8. In ThingWorx 7 it is working fine.
I could not reproduce as you can see in the screenshot below, are you sure that columns for which you want to have them editable are enabled for editing?