Today I tried it again changing all the 3/4 Generic to Maple using Global Item Mod - I selected all cabinets in my library and populated the sheet goods, set 3/4 Generic to replace with maple, populated boards, set 3/4 Generic to replace with maple and proceeded with the modification.
At every cabinet I received the error Material not found (3/4 Generic) so I selected my Maple to replace it and repeated with all the cabinets in the library. (took about an hour)
All is well, installed a couple base cabinets in the room enjoying life, then tried to install another cabinet

Material not found, Board stock Maple !! Not sure what is going wrong but it cant seem to remember the material - when I click on Available Replacements only a couple choices come up, Not my full list
I spoke of this problem when it first happened and someone said I just need to add the material but by doing that I actually added another 3/4 Generic to my material list and it still had the error
Am I the only one that has this problem after a Global Item Mod on a library ????