If you are getting the message 'Material Database Not Accessible' this is an indication you have installed the CutData option but do not have this option on your key or have not checked out the option with your Network License Option. Follow these steps to clear this message.
Launch GibbsCAM and go to Plug-Ins→Misc→Pathfinder→CutDATA Folder
Locate and delete Material.txt
Close GibbsCAM and re-launch the software
You will receive a message about the material file missing but this will only occur upon launching GibbsCAM the first time after deleting the material file.