No. When i am viewing non-HD content, i typically have the same issue all the time. I can adjust the aspect ration on the slingbox viewer as follows:
AR = auto - yes, i hvae the problem
AR = normal - yes
AR = wide screen - no i don't have the problem. However wide screen stretches the image to fill the whole screen and i prefer to view in Auto mode.
Similarly, i can adjust the zoom as follows:
Zoom = default - yes, i have the problem.
Zoom = Letter box - no, i don't have the problem. Again, however, i prefer Default setting becuase Letter Box trims some of the image
Zoom = pillar box - yes
Zoom = window box - yes
Zoom = anamorphic - yes
I only have the problem when viewin non-HD channels. HD channels broadcast in wide screen format AR = auto and Zoom = default result in an image that fills the screen .... so no problem. It's just non-HD channels.
So my best bet for non-HD is AR=auto and Zoom = letter box... unless you can suggest some way to stop this from happening. Perhaps it is a problem with my computer.