James,
In the SCLogin module parameters, make sure you've specified both a height and width parameter. In earlier versions of the SCLogin module, we always showed a square picture. Due to the addition of Google, we had to change some things, and one of those was to let the picture grow if necessary.
Once you set the parameter in the SCLogin module, when you logout on the front-end and log back in again, it should display correctly.
If not, let us know.
Thanks,
Alex