CGI:url-translate did not translate correctly when taking a url-encoded UTF-8 strings as input and running UTF-8 enabled newLISP. The new version 2.3 does the translation correctly on UTF-8 and non-UTF-8 url-encoded strings and on both versions of newLISP:
http://www.newlisp.org/downloads/cgi.lsp
The error occurred when processing from variables with cgi.lsp on UTF-8 enabled newLISP and forms containing the a utf-8 charset meta tag.
The file should also be replaced newlisp-wiki-x.x.lsp and newlisp-ide-x.x.lsp and will be part of the 9.4.0 release in the modules directory.