What is going on ?!?!? I can't start logic pro in 64-bit mode

I have been struggling with this issue for a while now, but I haven't made any progress. I am unable to start Logic Pro 9 in 64-bit mode. And when I say that, I mean that if I select the Logic Pro app in Finder, and say "Get Info," there is no "Start in 32-bit mode" option like all of the tutorials say to do. It used to show up, and I was able to start in 64-bit mode just fine, but suddenly, the option is not there, and the app is starting in 32-bit mode.
My Mac/OSX have been running so well, that I'm not too knowledgeable about where to even start looking for a solution. I am very comfortable with the Terminal, etc, so I can follow directions well, but I don't know where this problem stems from.
The machine is running in 64-bit mode, ie, if I do uname -a, it does return that the system is running in 64-bit mode. Logic runs just fine outside of not starting in 64-bit mode, but I want/need to be taking advantage of all of the RAM I spent so much money on.
I'm not sure what info would be needed, but here goes:
Mac Pro 3,1 (early 2008), 8-core 2.8Ghz.
10GB RAM
4 SATA HDDs
NVidia Geforce 8800 GT 512MB RAM
OS X Mavericks with all current updates
Logic Pro 9.1.x, again,  with all updates available.
Steinberg UR22 audio interface (USB)
Also, I'm not sure if it matters, but I also have Windows 7 installed through Bootcamp, and it is running fine, and recognizes 32-bit/64-bit apps just fine.
I hope that's enough for someone to be able to tell me where to start looking. I really don't get it. This was happening when I first installed Mavericks. I ended up doing a fresh install from USB stick, and everything was going fine. I don't think that an update has changed things, as the last time I opened Logic, it did open in 64-bit mode. Suddenly though, that option is unavailable.
Is there a plist entry I can edit that will force it into 64-bit mode?
What part of the OS is in charge of this type of thing?
Any help is greatly appreciated.

Could be corrupted preferences.
In the Finder, choose Go > Go to Folder from the menu.
Type ~/Library/Preferences in the "Go to the folder" field.
Press the Go button.
Remove the  com.apple.logic.pro.plist  file from the Preferences folder. Note that if you have programmed any custom key commands, this will reset them to the defaults. You may wish to export your custom key command as a preset before performing this step. See the Logic Pro User Manual for details on how to do this. If you are having trouble with a control surface in Logic Pro.
Be sure and use the ~ character in the path name.

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