Why did my mouse stop scrolling after upgrading to mavericks?

Question

I have completely lost all ability to scroll with my Apple Magic Mouse after upgrading to Mavericks.   Why did this happen?   How can it be fixed?    It worked fine with Snow Leopard and Mountain Lion. 

Answer 1

Everyone:
I was able to solve my own problem, after scouring the Internet looking for solutions.  Sadly, the Apple Support Community was of no help. 
Here's the full story:
I originally had purchased my iMac with Snow Leopard installed.   I loved it just the way it was, and really did not ever want to upgrade.  However, I've been around computers long enough to know that I would HAVE to do it someday, only because of the age old problem of wanting to run some new application in the future, but not being able to, becasue the app would only run on the latest version of OS X.  I reluctantly upgraded to Mountain Lion less than a year ago, without too many problems -- nothing I wasn't able to fix fairly easily anyway.  When Mavericks came out, with the "offer I could not refuse" price of FREE, I knew I would eventually have to install it. 
So the day comes when I'm finally ready to install Mavericks.  To get ready for that day, I did the following:
I ran CCleaner on Mountain Lion to clear out any old files accumulated.  (No longer works in Mavericks)
Made sure my Time Machine backup was up to date
Cleared out gigbytes of old files off my hard drive, and archived them on an external USB drive
Made sure every single app on my iMac was fully upgraded.
Made sure Mountain Lion itself was fully upgraded! 
I then set aside a full day for the upgrade, knowing full well how long it could take, even with a very fast internet connection.  Eventually I worked up the courage to go to the App Store, and proceded to download Mavericks. 
The update seemed to go smoothly enough, no problems that I noticed.  So I finally get to the point where I can sign on to my iMac again, opened up the Chrome browser, and found out that my mouse was was unable to scroll.  I then opened up Firefox and Safari, and found that I could not scroll pages on those browsers either. As a matter of fact, I couldn't scroll using my mouse no matter what app I tried.  That feature was completely lost.  
I went to ' System Preferences --> Mouse ' to look at the settings, and only the most basic settings were available: click and speed, nothing at all for scrolling or swiping.   That's not good....
Looking to see if anything else was missing in System Preferences, I saw that there was no option for Blue Tooth at all.  As a matter of fact, Blue Tooth was completely inoperative, and there was literally nothing I could do to make it work.  The Mavericks upgrade had completely trashed Blue Tooth on my iMac.  I have no idea how my wireless keyboard and Magic Mouse were even operational, Apple must have some sort of "back door" that keeps those two connected even when the entire Blue Tooth subsystem is off-line.  
Since there was absolutely no way to fix this, given the damage done by the Mavericks upgrade, my only choice was to do a complete re-install of Mavericks.  I did this by turning off my iMac, and then after turning it back on, I held down the command + R keys to initiate the "recovery" of my iMac, and re-installed Mavericks. There are screens the are displayed that walk you through the process, which is fairly easy and strait-forward. 
This above process is a feature called OS X Recovery, and it has been present since Lion.  Here's a link to an article that explains it more fully:
OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
I did not know about this feature, but found out about it after doing various web searches in an effort to find a solution to my problem. 
So, I basically ended up installing Mavericks a second time.  This took hours to accomplish, but it worked.   After the second installation, I signed on, and sure enough, Blue Tooth was back in operation, and my Magic Mouse worked without any problems what so ever.  I had full scrolling ability in all my apps.  
So OS X Recovery saved the day, at least for me. 
I should note that before doing the Mavericks upgrade on my iMac, I had already performed the upgrade on a family member's MacBook, without any problems encountered at all.   They were still running Snow Leopard, the orignal OS that came with their MacBook!  Like me they were reluctant to upgrade, but eventually it becomes a necessary evil. 
Here's hoping that this information may be of use to someone in the future. 
Northwest Line
14 FEB 2014