Is this a concrete block wall or brick masonry? The cracks have manifest in the head and bed joints?
The problem has nothing to do with "creep", creep refers to short and long term deflection which commonly occurs in heavily loaded concrete or prestressed concrete.
I believe that the problem is either related to temperature/moisture or differential foundation settlement. A brick wall behaves much differently under environmental effects than one might think. A brick is constructed by removing moisture, thus a brick wall will actually "grow" over the lifetime of the structure as it absorbs water. The concrete foundation and mortar joints behave quite the opposite and shrink as part of the hydration process. Concrete blocks are much more compatible with the mortar and concrete obviously.
A house I once lived in had a concrete block basement walls. The house was located in a valley, in fact, several street sewer inlets were located on the road in front of the house. Every time there was a torrential downpour and the sewers backed up, there would be standing water near the basement wall. The soil would swell up and move the foundation only to cause large cracking (along the running bond) in the wall when the water table went down and the soil dried up. I mention this only as an example of what events can lead to cracking. A simple piering or underpinning would have corrected the problem. While I was there I tried a flexible silicon caulking (paintable) but to no avail. I should note that there were long periods wherein no movement occured and other times it moved quite abit.
I will keep an eye out for a remedy, but I am skeptical. [sig][/sig]