Version: 1.13.0 (using 4.4.00 (KDE 4.4.0), Kubuntu packages) OS: Linux (x86_64) release 2.6.31-19-generic When attempting to preview an HTML message in KMail the preview pane remains empty most of the time since the KDE 4.4 upgrade. Sometimes (can be provoked through repeated selection and de-selection of the message in the message list until the message preview stays visible) the message is displayed. When the preview pane remains empty the message is typically visible for the fraction of a second before it vanishes.
Created attachment 41224 [details] Screenshot
The problem still occurs with KDE 4.4.1 (KMail 1.13.1). Another observation: The issue seems to affect all mails that have attachments (HTML and Plain Text).
I confirm the problem, I'm attaching an email which is not working
Created attachment 41696 [details] mail_html_sample.txt This email body is not displayed as HTML in the preview pane
The problem vanished with KDE 4.4.2 although I did not find any related fix in the changelog.