I'm trying to add a comment, and ikiwiki fails with this error message:
Error: HTTP::Message content must be bytes at /usr/share/perl5/RPC/XML/Client.pm line 308
This seems to happen because I had a non-ASCII character in the comment (an ellipse, …). The interesting part is that the comment preview works fine, just the save fails. Probably this means that the blogspam plugin is the culprit (hence the error in RPC::XML::Client library). I'm using version 3.20100815~bpo50+. Thanks!
I've filed an upstream bug about this on RPC::XML: https://rt.cpan.org/Ticket/Display.html?id=61333