I'm experiencing the issue #424378 I reported a few months ago, occurring again. - https://bugs.kde.org/show_bug.cgi?id=424378 Using Arch Linux with the latest available packages. Please let me know if you need any more details. Thank you.
Please note, that the bug has been fixed in 5.1.1 and you report it for 5.1.0. BTW, 5.1.1 has been released today. *** This bug has been marked as a duplicate of bug 424378 ***