Make sure that the new copy you've downloaded is stored inside your matrix directory (i.e., the parent directory of the lkb directory in which the script file you're loading is located, cf. the faq on loading grammars).

Make sure that the new copy you've downloaded is called matrix.tdl and not matrix.tdl.txt or anything else. Some browsers try to be helpful and add the .txt extension, even when it is superfluous. You may need to configure your directory browser to "show extensions" in order to see what's going on.

Back to the Grammar Engineering FAQ.