We do not use Toolbox parts, this is a guess on my part.
Try having the administrator put the Toolbox parts in a write protected folder in PDM. Most of the time Toolbox parts are not under revision control.
Bradley
SolidWorks Premim 2007 x64 SP4.0
PDM Works, Dell XPS Intel(R) Pentium(R) D CPU
3.00 GHz, 5 GB RAM, Virtual memory 12577 MB, nVidia 3400