I have 2 plat styles setup, STYLE.CTB and STYLE.STB. When a user switches a drawing from .CTB to .STB, the Plot Styles assinged to the layers are all screwed up, i.e. Layers that should be using THICK plot style are using THIN, etc. I am sure there is something screwed up the the COlor Mapping Table for STYLE.CTB. After about a 30 minute search through ACAD wonderful help file, and finding absolutely nothing about changing the Color Mapping Table, I have turned to this Forum for Help. PLease advise on how to change the COlor Mapping Table. Thanks in advance.