Toolbox Import/Export Problem SW2013 SP5.0

So I decided to do a little admin on my toolbox this morning as it has got rather untidy.

As part of this process I've been happily exporting fastener configurations to Excel, bulk editing and reimporting.

I've managed to do this succesfully for several different types of fastener, bu tnow when I import an Excel file into the part I'm currently trying to update, it isn't updating the Description field. Any ideas?

SolidworksToolbox