Christian, My own inspection of the code shows that inputPos should have a length of outlen and outputPos should have a length of inlen. So you can commit that patch. For Timothy: Does the use of srcMapping mean that screenreaders will no longer have to use the pas1Only mode bit and can thus get the full value of correct and multipass opcodes? This would be a real advance. It would be useful in other situations as well. Thanks, John -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities For a description of the software and to download it go to http://www.jjb-software.com