Inserting Toolbox parts causes unhandled crash SW2012

We have SW2012 running on 3 machines each accessing the same Toolbox, on our server.

2 of the machines have no trouble accessing, inserting and using the Toolbox parts.

1 machine crashes if any Toolbox parts are inserted  via the Toolbox browser or if a file containing toolbox parts is opened. This machine has same permissions as other machines.

The individual Toolbox parts can be opened using File-Open without crashing SW.

Anyone experienced this/suggestions for fix?

VBR

SolidworksToolbox