When loading a wav file in the browser the timeline background does not repaint fully. I am seeing this on ToT Safari, but can demonstrate this on Google Chrome Canary also (not sure which change list it is built on). Open up a web browser and load a wav file, such as: http://www.clayloomis.com/Sounds/simp319c.wav or http://www.clayloomis.com/Sounds/simp302b.wav You may need to reload the "page" twice. The rendering bug doesn't occur consistently. On Canary, after the welcome screen, I load the latter URL, and after the .wav plays, I get a display similar to what is attached. As soon as I focus another window the timeline repaints appropriately. Subsequent reloads work fine. I think it may have to do with files that load quickly, but do not appropriately repaint the timeline.
Created attachment 93695 [details] Screen shot of buggy rendering on Canary (but it also seen on Safari)
<rdar://problem/9435902>