Problem with Screen Jumping When Using Paintbrush

Anyone else experiencing this? Any solutions?

I am experiencing a problem when using Paintbrush as part of the Foreground Selection process, but it may well happen in other areas. If I have an enlarged view such that only part of the image is displayed, then when I am using the Paintbrush the image will sometimes scroll (presumably to keep the area I am working on in the centre of screen) but the Paintbrush remains at the same position on the screen. The result is a vertical Paintbrush stroke that I don’t want. This is particularly annoying in Foreground Select because of the time it takes the software to do its calculation and then perform an Undo.