Version: (using Devel) OS: Linux Installed from: Compiled sources kdebase is rev. 1129428 KDE shows a lot of error messages with the text "Cannot find mymetype application/octet-stream" and some more mime types. Dolphin always shows placeholder icons instead of using mimetype icons. These messages are shown on almost any application launch.
Seems related with missing/broken 'shared MIME database'. Could you please check if the correspondent package in your distribution is installed/corrupted? Thanks.
Works fine in 4.7.2. Closing as fixed.