I've been trying to uncap the client's addon memory by setting it to "0" like many have been suggesting. With every client I have tried however, it ended up replacing the Unitframe portraits with a nearby texture. These are usually textures that have already been rendered, so if I am in Ironforge the portraits will be replaced with a tile or partially with an object that is nearby.
EDIT: Appears to be a conflict with the AMD Catalyst Control Center and not caused by the WoW Client. You can delete this thread.