I updated today to the latest version of PyDev (2.7.2), everything went smooth, I restarted Eclipse and then the vertical scroll in the PyDev editor stoped working. The scrollbar is moving, but the text is not scrolling. The horizontal scroll works though. This happens only with python files. When I open a text file or some other kind of file (not .py) scrolling works fine. Does anyone has any idea why this is happening and maybe how this can be fixed?
UPDATE: A new version (2.7.3) has been released that fixes this. Try updating to that.
It's happening to me, too, and looks like a bug in the latest release. Here's the bug report.
I decided to revert to the previous version until this issue is fixed.