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Is it possible to run a GPU HOG with a custom window size?

I have been trying to train and run a GPU accelerated HOG detector using SVMlight and a winow size of 48x48 pixels.

I have gotten the HOG to work with the standard 49x96 window size for people, but when I try to train with my own data with a size of 48x48, the program stalls for a very long time in detectMultiScale() and fails to run properly.

This bug seems to be related:

I have tried in OpenCV 2.4 with no success, and now I am trying with the CUDA library in OpenCV 3.0 but still getting the same stall issue.

My question is, has anyone managed to get this working with a custom window size?