In the old days (a few years ago) I’d be among the first to do Mac OS system upgrades. And, over the years Apple has gotten a lot better at making the process easy and reliable. These days I take a bit more time because I depend on various applications that don’t always get upgraded with the system. Best to protect your core applications until you’re sure their various developers have versions that run with a new version of the OS.
All of that said, I upgraded to Yosemite a few days after the free update went live. The process was painless and easy and on the first day I upgraded my various printer drivers (HP LaserJet 1022n, Epson Stylus Pro 3880 and Dymo LabelWriter 450) and never missed a beat on printing.
I heard that some had problems keeping their wifi connections working but I never experienced that.
Today, however, I decided to go through both my applications and utilities folder and run everything to see if and then how Apple changed their core applications (they haven’t really updated the Keychain Utility, too bad). When I ran Airport Admin utility it showed that I was connected to the internet but would not bring up my AirPort Extreme base station. So, I was connected to it but could not see it in AirPort Admin.
I ran AirPort Admin on my iPad and the base station showed up, so, this was a problem with either my new MacBook Pro and/or, the Yosemite upgrade.
It seems others are having similar problems: OSX Yosemite Wifi issues.
My friend Edward (and others) sent me an article that contained numerous possible fixes, here’s the one that worked: Intel-based Macs: Resetting the System Management Controller (SMC).
The SMC controller is a chip that holds settings that sometimes needs to be reset. For new MacBook Pros with non-removable batteries, holding down: Shift + Control + Option (on the left side of the keyboard) and the power button at the same time for 10 seconds, then letting go, then powering up, will reset the SMC.
Once that was done Airport Admin recognized my AirPort Base Station.
This is less of an issue for me as I never had problems connecting to wifi, but if I had a Time Capsule (an AirPort Base Station with built in hard disk running Time Machine) I’d be out of luck for backups and many are having that problem.
I don’t know if this SMC reset will work for every instance of the problem, but it worked for me.