System Information
Windows 8.1 x64
Renderer: GeForce GTX 860M/PCIe/SSE2
Vendor: NVIDIA Corporation
Version: 4.4.0
Blender Version
Broken: 2.72.1 4d4da31
Short description of error
Cant use driver variable with Dimensions property, while Scale property is working.
Exact steps for others to reproduce the error
Open blend file
bpy.context.active_object.dimesions.x is working just fine in console.