Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
The most I can say, try making small change, putting that back again, and save it. Also check your configuration, a lot has been added for CSC to use in CLI in the last 4 mos. check for any statement already exist regarding class-map, csc fail-open...