See http://i.imgur.com/bpkbuDf.png This occurs at random, sometimes it will just happen within minutes of using KDE, other times it can take hours, and sometimes it doesn't happen at all. I do not know what triggers it but the menu text becomes unreadable (it looks like a mixture of font size going to 2 and some blurring but I'm not really sure what's happening). Reproducible: Sometimes Steps to Reproduce: 1. Leave KDE running whilst using PC and sometimes it happens, sometimes it doesn't Actual Results: Menu text becomes unreadable Expected Results: Menu text should not change Arch linux 64 bit NVIDIA drivers KDE 5.6.1 Default themes
This is a upstream Qt issue we used to see, check if you can get your hands on a newer Qt.
I can confirm this issue is present in the latest Kubuntu 16.10 beta (will add attachment following this comment). Bug confirmed on Kubuntu 16.10 beta 2 x64 KDE Plasma 5.7.2 KDE Frameworks 5.26.0 Qt 5.6.1 Kernel 4.8.0-17-generic Nvidia 367.44 proprietary drivers (GTX 970ti graphics card)
Created attachment 101379 [details] Example of issue on Kubuntu 16.10 beta 2, dated 2016.09.31.
*** Bug 385561 has been marked as a duplicate of this bug. ***