Toolbox is ok, but it is much easier creating your own product library.. I think it is pretty stable today, from what I hear, but there was an update a few years ago that really messed things up and I vowed then I'll never ever use it again. Might eat my words someday, but create a part with a design table and it works very similar to the Toolbox and you can use your own custom properties instead of spending a lot of time changing the SW Toolbox Custom Properties...
Right click on the toolbox folder and make sure it is not read only.
Close SW, rename the ToolboxFiles.index file (found in the browser folder) to ToolboxFiles_Old.index. Start SW and check.