I use OS4.1 & the ppc version of amrss. The new HTMLview.mcc IS hosed & I had to fall back to version 12.6, 68k version. HTMLview.mcp v13.4 is fine, version 12.6 is on aminet.
The ppc version of YAM also uses a codesets lib & the newer versions also crash amrss. I'd say amrss is at fault given all the newer files that crash it & Jen's isn't responsible for amrss.