All commands were working fine last week but opened up InDesign today and for some reason all the Shift-based commands are not working properly (i.e. automatically drawing 45 degree angles and proportionally resizing shapes). Working on a Macbook Pro 2012 running Yosemite 10.10.1
That's almost always because of system or third party software that's stealing your keyboard shortcuts.
Check System Preferences > Keyboard > Keyboard Shortcuts. Investigate third party software and browsers that may be operating at the same time.
If necessary, set up a new user and launch InDesign in the new user to check the problem.