Jumpy erratic cursor/arrow - Moves & Selects without touching

One other thing to consider is to make sure nothing else is touching your magic trackpad, especially the Lightning cable that's used to occasionally charge it (or some may keep it permanently connected). I had a jumpy cursor suddenly and I couldn't figure out what it was until I noticed that part of the cord was very slightly touching the upper corner of the trackpad. Once I moved it out of the way, suddenly the cursor was behaving normally again. Just something else to consider for folks.

I had this problem. Some research on here and in other forums was most unhelpful. The best solution I found was to rewire the Airport and Bluetooth parts of the computer itself. However, I lucked on this simple trick.

1. Turn Bluetooth off

2. Turn Bluetooth back on again.

Old question I know, but have had and solved this problem -- in two separate situations.

If you've had your Macbook for quite a while, open the case and check to see if the battery might be swelling due to age. If the battery isn't perfectly flat, this could be a cause of the problem.

A swollen battery can put pressure from the underside of the trackpad and cause the cursor to behave oddly or poorly.

In my case, replacing the battery fixed the problem.

i have the same problem to with my unibody late 09 macbook and im going to call apple 2morrow about and see if they can do anything

I have the same problem. It occured right after I updated Snow Leopard with the 2013 Security update. Everything was fine prior and now my macbook is useless while connected to a monitor and using magic track pad. When disconnected from monitor and not using the magic trackpad, the macbook built in trackpad seems to be fine on its own. But the update definitly broke my magic trackpad. Help!

Mine is behaving erratic since this morning, it was working fine last night. The only thing I remember to install before this is the security update by apple.

I have my macbook pro (early spirng 2011) for past two years and I never saw this before, dont' know what to do !

I'm having the exact same problem after I updated to 10.8.3 (now that I recall, it could be the most recent security update) on my mid 2009 13" MBP. It's crazy! I first thought someone hijacked my Mac with Back to my Mac or Teamviewer or some other remote accessing.

I ggogled around but to no avail.

It's completely useless now after it starts acting up... Restarting, clearing PRAM nothing works. 😟

I have no problem with my 2012 11" MBA...

Same here!

Same problem with 2011 MacBook Pro. All startedd after latest OS upgrade. I tried disaabling Bluetooth and that worked for a few hours. Tried using a mouse and while it is a little better, machine is useless!

Ditto.

Same here! It would only stop for a few minutes and than start up again. Any solutions ?

So far I have discovered that there are no fixes for the trackpad. I did however change the settings in accessibility where I checked the box to disable the trackpad when an external mouse is present. With this setting and an external mouse, the trackpad no longer works but I can once again use my MacBook. I am therefore assuming that the trackpad is kaput and I need a hardware change. Will confirm once I have an opportunity to bring it in to a store.

Went to the AppleStore Shibuya here in Tokyo this afternoon.

Showed the Mac and when the cursor started to move on it's own to the Genius who took my case.

He said that Apple does not have any answers but recommended me to wipe the whole machine, and do a fresh reinstall.

Lame answer! 😟

What really dissapoints me is watching so many reports already and Apple doing nothing, no updates, nothing, thye only seeing. I can't even write this sentece, it's so frustrating, pist me off, I can't use my MacBookPro since last weekend. This is stupid, hope they fire the guy responsable of this bug. Just when I need my PC more than ever!!!