Missing Workpiece Issue

Yesterday I designed a new sign in Aspire and imported the gcode files into Easel. I like to use Easel as the gcode sender. There are five toolpaths in the project and each one was loaded into a separate workpiece. I ran the simulation on each workpiece and was happy with the results.

This morning I’m planning on carving the sign, but when I open the file in Easel three of the five workpieces are now blank! Has this happened to anyone else? Anyone know of an easy solution short of reloading the missing toolpaths?