Not usually my style, but I just created a target from an odd sized image.
812 x 574
In the analyse features view, it looks like it has downsampled the image by a factor, then padded the result to a multiple of a power of 2. It has inserted a filthy black bar in the padding, could this effect the tracking quality? Should I be aiming for a multiple of 16 in my source images?
P.S. Sorry couldn't make the attachment work, didn't like png or jpg :-(