Can't double-click edit BOM table entry in 2014 SP2?

I used to be able to double click on a cell in the BOM table and edit the text - delete a p/n or change a description - but since upgrading to 2014 sp2 from 2013 sp4, I haven't been able to do that. Did they change the way 2014 handles BOM tables, or is this just a bug in this release? The use of Toolbox parts pretty much means I have to edit the description and remove the cryptic p/n for every part I use - now how do I do that???......

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