Properties palette not responding

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I'm currently working on a project and I'm unable to change any settings using my properties palette. For example when I've selected a wall, I want to change the top constraint/height but when I go to click that option in the properties palette it won't respond to my click. All settings in my properties palette are not responding to my click. It's like the whole palette is frozen.
I'm in Revit 2014 and I've tried uninstalling and reinstalling but the same thing keeps happening. I've even tried installing all newer versions of Revit and the same thing happens as well. I've never had this issue until yesterday. I've been running the program smoothly for nearly 2 years.
Any one able to help? I'm seriously at a loss what's wrong. Note I am running the program using Parallels for mac.