Weird Characters in tab titles
Recently I realized a wierd behaviour with Eclipse. While using Dark Mode Eclipse rendered the tab titles with completely unreadable characters. The reason for this under Windows 10 is a glitch fonts. I installed some fonts and one of them somehow was set as default. In my case Segoe UI cause the issue.
To fix this f***, simple navigate to "Window > Preferences > General > Appearance > Colors and Fonts", search for "font" and change the used font to something useful. Under "Part title font" you will see a preview of the rendered tabs, so you can check which font is working for you.