Sorry, I do not have exact list of circumstances under which this occurs. It is rare, but just frequent enough to annoy; all I can tell you is image disappears from view sometimes when I'm using the move/rotate/zoom tools which I do very often to get perfect angle for brush strokes.
Just now I rotated about 270 degrees, moved canvas slightly right, pressed button bound to zoom in function and image vanished from view. I believe it is merely moved/scaled out of the viewing area. I am left banging on the scale/position/rotation reset tools to bring back what I laughably term art.
Resetting rotation, scale, then position brings it up centered perfectly. If I could create macro for this all would be copacetic.
Resetting position, rotation, then scale brings it up centered on upper left corner of my display.
Resetting position, scale, then rotation does same thing as above.
Perhaps the issue is my computer; I am using Intuos2 tablet with old Wacom V4.78-6 drivers. No newer ones support mouse button box functionality. Also my OS is Windows XP, with dual monitor arrangement.