This started as a problem with being unable to set multiple archive methods, but actually applies to all forms that have repeated request parameters (i.e. checkboxes). MT only picks up the first instance of the request parameter (the first checkbox) and ignores the remaining repetitions.

Perhaps it's a problem with request/response handling, because I also get a blank page whenever I submit a form (and have to back out using the browser back button). Occassionally I get a broken pipe error message from my web server. I'm running Jakarta Tomcat as my webserver. Anybody else see this problem with this platform? This is only my guess.

Solved it. This is of interest to Tomcat users. MT doesn't work if you are using Apache Tomcat as your http server. Tomcat's cgi support is buggy. It creates all kinds of problems with multiple request params, etc. Instead, you need to use Apache http server to handle cgi requests.