The body of the (probably spam) message attached can't be displayed in RC 0.9.4 and 1.0-git (Win7/64 and IE8). Roundcube keeps displaying "Loading..." forever at the top of the screen.
It's even tricky to download it as an .eml, and I can't recall how I (accidentally) managed it after several unsuccessful attempts. Usually all menu commands such as "Download (.eml)" or "Show source" do not react anymore at all, also "Toggle raw message headers" doesn't work. All that is being displayed in the preview pane, are the standard headers.
The only string that I changed with a hex editor in the attached message, are the several occurrences of the address of the original recipient.
Replicable...?
Michael Heydekamp Co-Admin freexp.de Düsseldorf/Germany