I'm used to using the Ctrl + -> keys to move to the next word and Ctrl + Shift + - > to select the next word. But sometimes it happens to me that the eclipse does not work.
In the preferences Window-> Preferences-> General-> keys the combination appears correctly, but in spite of that, nothing happens.
The start window causes this type of error in the editor apparently takes years without being corrected ( link ).
Sometimes when you start the editor when you have many plugins, or in a heavier version such as sts, you can not use that control combination and arrows to scroll in the editor window, but in other windows like the console works properly.
A quick solution is to disable the welcome screen or you can also restart eclipse so that the methods run more efficiently thanks to the Java warmup em>.