GX/cursor problem in SunView

[Alan S. Mazer]

I've got a weird problem with a piece of SunView software that seems to be
correlated with the availability of a GX accelerator.  Basically, as I
move the (crosshair) cursor over a canvas containing rapidly changing
graphics, bits of graphics don't get erased properly and portions of the
cursor drop out.  If I refresh the screen everything is okay again until I
start moving the cursor.  It looks like there is some cursor/graphics
interaction which is screwed up, but since this has worked fine until the
last year or so and still works great on machines without a GX, I'm not
convinced that the problem is in the software.  Are there any known bugs
involving the GX or SunView cursors?