Hello All,
I hate to have my first post be a technical issue but unfortunately none of my classmates have been able to see me through this issue. What's happening is that every time I open a scene in Maya I get a strange Stack Trace error message. Soon as I open the file, a display box appears and says:

"Invalid negative index used to reference array "$gRelatedNodes".
Start of trace: (file: /Users/Shared/Autodesk/maya/2013/scripts/showEditor.mel, line 2008).
AEbuildControls (command window: line 1)."

I also can't seem to open the Attribute Editor inside Maya. Whenever I go to open it, the Stack Trace error msg that appears reads:

"Cannot find procedure "AEsetDisplayToEmpty".
Start of trace: (file: /Applications/Autodesk/maya2013/Maya.app/Contents/scripts/others/updateAE.mel, line 504).AEsetDisplayToEmpty (file: /Applications/Autodesk/maya2013/Maya.app/Contents/scripts/others/updateAE.mel, line 504).
updateAE (file: /Users/Shared/Autodesk/maya/2013/scripts/showEditor.mel, line 2804).
autoUpdateAttrEd (command window: line 1)."

I've attached both images below. The first is for the opening of the Maya scene and the second is for the Attribute Editor.

Version of Maya: 2013
System Specs: Macbook Pro 10.7.4

Thanks guys/gals!