All WebStorm EAPs have some rendering glitches on 4K Monitors under Ubuntu 15.04/15.10 and probably also 14.04/14.10:
- the splash screen is not scaled (too small); before the main dialog is displayed, it scales up with the wrong clipping
- the code inspection result squares in the top right corner of the editor pane are too small
- the submenu triangles are too small
It looks good on a 4K monitor under OS-X.
The same is true for PyCharm EAP 5. What's really strange - in IntelliJ IDEA EAP 15 RC everything is too small and unuseable under Ubuntu. I thought all Jetbrains products use the same code base for displaying fonts, images and icons.