Why are my CIF and GDS II files difficult to edit after being read?
Since Electric drawings consist of connected parts, and since CIF and GDS have no connectivity in them, this means that imported CIF and GDS does not contain the necessary information for full Electric design. You can still view the files, and you can still include them in mask output. However, many Electric tools (such as network analysis and DRC) will not properly understand the layout. Use the Node Extractor to convert the artwork to full Electric components.