Weird problem with panning while zoomed in

[Y-Phil]

Hello

I have PSP Pro X6 64bits french with the lastest service pack installed.
I tried this:

1. Zoom in a picture that's bigger than the screen
2. Insert a vector object (ellipse for example)
3. Switch to the "move" tool and try to move the shape to the top of the picture. I went too far towards the top and I went beyond it. As I lost it, and after having zoomed out, I went back one step in the "Undo" list to retrieve it

That's where weird reaction are beginning: the refresh system is somewhat lost: I have to zoom out/in with the mouse to force a refresh. Sometimes, I move the object and it seems to jump back

[Kathy_9]

SP1 seems to have introduced a number of odd behaviors related to zooming. Also, they seem to be random and not easily reproducible. I have reverted back to pre-SP1.