Hasta La Motion!

I am on 6.1v1 and I am experiencing a slight bug. I know this is fixable because the normal VFX crew here identified the issue and had a workaround, but they are all unavailable so i thought i might post the question on this forum.

I have a couple of shots I am working on that are at a very large resolution. My tree is very simple as I just started to build it. I am reading in the source @ 3504 x 2336. Directly after the read node i placed a Transform mask node and fed a roto node into the mask input. When i draw my roto shape it is exactly where i want it to be, but as soon as I jump to viewing or working with a new node my roto shape moves off screen. I then move it back to the general area i want it to be again and there is no alpha associated with the shape. If i move the roto shape to a different part of the screen it shows up, but often the alpha channel is stretched all the way to the edge of the frame, like what happens when you mess with the black outside checkbox.

Anyway, its obvious to me that I have a bounding box type of problem, but I cant seem to fix it. Within the roto tool I changed the shape to "no clip" which did not alleviate the problem. Does anyone know the workaround for this?

Thanks-
B