https://bugs.kde.org/show_bug.cgi?id=385755
--- Comment #2 from Piotr Mierzwinski <piotr.mierzwin...@gmail.com> --- I have plugin you mentioned: $ ls -l /usr/lib/qt/plugins/kmarkdownwebviewpart.so -rwxr-xr-x 1 root root 64840 10-01 01:57 /usr/lib/qt/plugins/kmarkdownwebviewpart.so $ pacman -Q | grep -i kmarkdownweb kmarkdownwebview 0.2.0-1 $ pacman -Q | grep -i ktexteditorpreviewp ktexteditorpreviewplugin 0.2.0-1 BTW. In installation procedure there is some bug. In Arch /usr/lib64 is linked to /usr/lib and as far as I remember you try to create this (/usr/lib64) directory, so happens error in moment of installation. I just copied manually the plugin, after I built it. $ ls -l /usr/lib64/qt/plugins/kmarkdownwebviewpart.so -rwxr-xr-x 1 root root 64840 Oct 1 01:57 /usr/lib64/qt/plugins/kmarkdownwebviewpart.so $ ls -l /usr/lib64/qt/plugins/ktexteditor/ktexteditorpreviewplugin.so -rwxr-xr-x 1 root root 69072 Oct 12 00:20 /usr/lib64/qt/plugins/ktexteditor/ktexteditorpreviewplugin.so Back to current issue. When I open md file then "Hamburger" menu is disabled and the same "Update the preview ..." button. Enabled are following buttons: "Lock preview ..." and "Enable automatic updates ...". When I open ui file then "Hamburger" menu is enabled in ui preview and becomes enable in preview md file. In ui preview - "About KUIViewerPart -> About": Displays Designer's UI files - "About KUIViewerPart -> Libraries": KDE Frameworks 5.38.0 Qt 5.9.2 (built against 5.9.1) The xcb windowing system - "About KUIViewerPart -> Authors": Richard Moore Ian Reinhart Geiser In md preview: - "About KMarkdownWebViewPart -> About": For the rendered display of Markdown files in a webpage-like layout - "About KMarkdownWebViewPart -> Libraries" KDE Frameworks 5.38.0 Qt 5.9.2 (built against 5.9.1) The xcb windowing system - "About KMarkdownWebViewPart -> Authors" Friedrich W. H. Kossebau Probably this bug is related with reported by you. I mean bug id: 384973. I observed the same issue when I opened in Kate as first ui file (no preview) and second md - preview turned on for both. Both I opened by "Open with" from Dolphin. I noticed that dependent bugs: 384448 384449 are not fixed yet. I have the latest stable: Qt5. Plasma, KF and KApplications, but it changes nothing if bugs in Kate are still not fixed. -- You are receiving this mail because: You are watching all bug changes.