please could you download news-aggregator from cvs now (or just file news-aggregator/tcl/source-procs.tcl) . i fixed the error relating to message
invalid command name "ds_comment"
could you try it again (of course, dont forget to reload package from apm or just restart you service)? And please continue posting bugs and comments to bugtracker so we could mantain it up to date ( i saw you posted this as bug #2713, right?)