I have go a large scene http://www.mediafire.com/?9ycfg2li0h6wawn . When I pan and move camera with CTRL and SHIFT the speed is getting slower and slower until I can not move at all. I can rotate normally though. How do I override this behaviour? Scaling the scene seems not to help. Thank You very much.
Try View Selected in the Select menu on the 3D view, or . on the keypad. This often cleans up this sort of thing.