This never happened in iTunes 12 when I was using Mavericks, but this started since upgrading to Yosemite. When I scroll, like lines of the text overlap and garble. I already tried deleting the iTunes plist files in my user library. It only happens in iTunes 12 and only when I scroll. Seems like the faster I scroll, the more garble I get.
iMac, OS X Yosemite (10.10)
I'm glad I'm not the only one seeing this glitch. I thought it was the age or speed of my MacBook Pro. I loaded Yosemite/updated to iTunes 12 and keep having to google search remedies for things...
Thanks for starting this thread. I'm having the same problem on my 2013 MacBook Pro.
I was hoping that 12.1 would fix it. No such luck.
Me too. Same problem. Late 2011 mbp
I updated to the latest iTunes a couple days ago and thought the issue was resolved until I began scrolling rapidly. It seems better but not entirely fixed.
It seems these redraw issues aren't just limited to iTunes for I've re-created a pseudo similar effect with CSS in Firefox. Unfortunately the problem doesn't work on any other browser, (not Safari) but only occurs in Firefox. It doesn't garble the text, but it garbles my background graphic. The little white cross hatching becomes makes little white horizontal lines when you quickly reverse directions, scrolling.
link that makes the effect: http://jakejilg.com/index.php
I'm guessing this is an Issue with the way Yosemite renders certain kinds of graphics.
Never mind my link! I can't delete/edit that post now.
I guess the bug only happens when slightly zoomed out, and I guess it was just how the browser was representing a fraction of a 3 pixel tiled image. And zooming out will do this on a lot more sites than just mine. I didn't know I was zoomed out.
However the overlapping effect is similar to iTunes. I wonder if there is some kind of designed zoom issue.
There's another thread going about this problem too.
To quote what I posted over there:
I have this exact problem on a 2014 MacBook Air, and none of the suggested solutions have worked over here either.
What I have noticed though is that the problem seems to get worse the more windows I have open. Closing all my other open windows and apps doesn't make the problem go away completely (at least not that I've noticed), but it does make the problem much better. With that in mind, I'm guessing it might be related to CPU usage and/or pressure on WindowServer or the graphics chips.
With Activity Monitor open and running, I can scroll up and down in iTunes, and can watch iTunes CPU usage spike to 40-45% and WindowServer to 45-48%. I have enough applications open right now (along with a large secondary display) that WindowServer seems to be working at 25-30% CPU usage all the time. Add these usage spikes to the combined usage of all the other open apps, and this leads to the CPU itself, or at least one core, being pretty much maxed out while scrolling in iTunes. No idea how much, if any, of this is actually related to the problem.
This also doesn't give me any real idea of how to fix it ourselves, as it seems like it might be an OS level problem...
This seems to be fixed in 10.10.3
fugnug wrote:
This seems to be fixed in 10.10.3
Perhaps I spoke too soon. The playlist view seems to be fixed, though it sort of chugs along choppily like there is still something wrong with the graphics. More-ever the garbling bug is still very much present in the radio channels list.
I have the same problem and as it has already been written, it doesn't happen in full screen mode.
Scrolling causes garbled text, only in iTunes 12, since upgrade to Yosemite.
