Oberon Color Replacer Error

I have one workstation that cannot run Oberon Color Replacer (lf_ColorReplacer29.3.8.gms). He always gets this run time error. Debugging always leads to this snippet about the palettes. I thought it might have something to do with a registry value so I deleted the whole registry key but no dice. It stills shows the same error. Any ideas on how to make it work again?