Side-scroll affects wrong "shelf" in iTunes Store

I'm on El Capitan again and just updated to 10.11.5 and iTunes 12.4. And the problem still persists. It's definitely a bug in the OS as the problem goes away when I downgrade OS X to 10.9.5.

abubasim66 wrote:

I'm on El Capitan again and just updated to 10.11.5 and iTunes 12.4. And the problem still persists. It's definitely a bug in the OS as the problem goes away when I downgrade OS X to 10.9.5.

FWIW, it is not a bug in the OS, as before, I have no problems scrolling with either the wired Apple Mouse or the wireless Magic Mouse on three different models of Macs. I don't have a Magic Mouse 2 to check. It could be a very specific hardware problem only affecting certain models but I think it's more likely it is some software that is installed.

If I see the problem appear when upgrading from 10.9.5 to 10.11.x then I would say it's a problem in the OS.

But it would of course be that the bug only affects certain models, and this explains why Apple seems to be ignoring this issue; it only affects a small number of users.

My MBP is a 13 inch late 2013 model with 8GB RAM and 256GB SSD.

abubasim66 wrote:

If I see the problem appear when upgrading from 10.9.5 to 10.11.x then I would say it's a problem in the OS.

FWIW, you can't really assume that. It could be the combination of 10.9.5 with "x" software is fine but the combination of "x" software + 10.11.* is not. Or it could be "y" software + "x" software + 10.11.*. There are a multitude of combinations. That's why it's so hard to find the issue sometimes.

I will test this by wiping my MBP and only install OS X 10.11.5 and iTunes 12.4.

That should help. at least you will know if it's a particular hardware issue with your particular year and model of Mac. Good idea.

I downloaded the updated El Capitan OS X installer (version 10.11.5) from the App store and created a USB flash drive using Apple's procedure.

I started the OS X installer and first erased (i.e. reformatted) my HFS+ partition, then did a clean install. Next I downloaded the iTunes 12.4 for Mac installer from itunes.apple.com and use it to update iTunes.

Upon opening iTunes and logging in to the iTunes store, the problem is immediately there when I use my Magic Mouse (the old model which I got with my old iMac, late 2009). Same problem is there when I use the trackpad on my MBP.

I will now downgrade my MBP back to 10.9.5. (I don't have anything of value on my MBP. All my files reside on a NAS box.)

And now I'm back on Mavericks 10.9.5 with iTunes 12.4 with no other software. And side scrolling 'drawers' in the iTunes store is working fine.

The only explanation i can think of is a hardware issue with your specific model of MBP and El Capitan. What model is it?

Late 2013, 13 inch, 8GB RAM, 256GB SSD. Works perfectly otherwise. Only this side scrolling issue, and in iTunes only with El Capitan. If it were a hardware problem I'd expect this to have a bigger impact.

And note that I'm not the OP of this thread. Other people have the same problem.

abubasim66 wrote:

And note that I'm not the OP of this thread. Other people have the same problem.

Yes, I'm aware. The problem is I have three different models of Macs and none of mine have the issue. It could be a firmware issue as well. You're right though one would think it would affect scrolling in any program, not just iTunes.

edit: I don't have a MBP however. an iMac, MBA and a 2015 retina MB.

Joel Pro wrote:

It's not that. I can cause this effect on (it appears) any Mac running El Cap. Laptop or desktop. I have tried this countless times on work computers and friends/family computers. It's a thing. I am convinced, anyone for whom this does not happen, simply does not happen to exhibit the inciting gestural behavior.

If it's hardware related it's probably got something to do with Magic Mouse (I've tried both 1 and 2).

FWIW, Joel, so far three users have reported this problem out of millions of Mac users. It's not a "thing".

I have the same problem and it is terrible because you not enjoying browsing movies.

And I want to clarify how to reproduce: shelf switched not by mouse move but by vertical scroll. If you do slow it can happen on third for example shelf, not second.

So steps looks like:

1) Open iTunes Store Movies

2) Place mouse pointer in New Releases (and don't move more)

3) Horizontal scroll to see movies in current shelf

4) Vertical scroll to change next shelf

5) Horizontal scroll to see movies in current shelf

6) Reproduce 4) and 5) until you realize that horizontal scroll works not for current shelf but for preview or even for prevpreview

After scroll froze on some "bad" shelf even after you select other shelfs the horizontal scroll works only for "bad" shelf.

For me it appears quite quick on second or third shelf, even if all seems right at 4th or 5th it breaks.

And for me it looks like:

"Hm, Ok, whats new, lets see next, lets se what recommend" you try to see next page of current (and active) shelf but upper (preview) shelf is moving and you so "FUUUUUUUUUUU"

FWIW, the first and second shelf (New and Noteworthy) are meant to scroll horizontally together.