About this Mac shows the number "135122" where it should show "OS X Yosemite"

Can you upload a screenshot of the About This Mac window? or the System Profiler window (whatever one you're referencing)

Reinstalling OS X Without Erasing the Drive

Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.

Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.

When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Continue button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

Also see:

Reinstall OS X Without Erasing the Drive

Choose the version you have installed now:

OS X Yosemite- Reinstall OS X

Note: You will need an active Internet connection. I suggest using Ethernet

if possible because it is three times faster than wireless.

Did you reinstall OS X? If not, then you aren't done yet.

Same problem here, reinstall won't help.

Same here. Although this seems not affecting performance, it is very annoying and i dont think reinstalling yosemite is the best solution.

Same here.. Two fresh Yosemite 10.2.2 installations. One on a 27" iMac shows "135122", the other is a 21.5" and it shows "OS X Yosemite" correctly.. Both 2011 iMacs..

Same problem here, I just update to 10.10.2

MacBook Air 13-inch Mid 2013

MacBookAir6,2

Prueba poner tu osx en inglés.

El problema solo está en español. Saludos.

I have the same issue and after a bit of looking around all i can find is the steps above which have not worked and no explanation to the issue? have you resolved this?

Same problem here.

Did a clean install from a USB stick on a Macbook Pro 2010 with a new SSD harddrive. Same issue.

Any solution yet?

thx.

I have fixed this issue, it is actually down to the language you choose. I selected english and experienced this issue however when i chose english UK it changed and all appears to be fine.

Thanks Andrew.

That's was working for me as well.

Thanks for this. Upgraded to 10.10.2 Yosemite yesterday and noticed the "135122". Didn't appear to give any operational issues. Therefore reluctant to start reinstalling the O/S as suggested in earlier posts. Found your later input and went into "Language and Region" in System Preferences and found Primary language to be "English". Clicked the "+" button and selected "English UK" - made this Primary. After System Restart all fixed - OS X Yosemite now restored to its original glory!