Running a recent build of TM2, I notice a bug in the highlighting behavior when making a scrolling selection. That is, when I select and drag using a mouse or trackpad, the parts of the editor that are highlighted is inconsistent. Chunks of unhighlighted area appear within a highlighted section. This appears most often when reaching the bottom of the screen, and the text scrolls upward.
Here is a short video screen capture showing the behavior: http://cl.ly/3S131O0F321i230l3x2T
Running Version 2.0 (9113).