When using Windows 7 (32 bit) and Coreldraw X5, when I zoom up the page, with grid on, and start moving TIFFs around, the grid disappears in that local area. The only option is to refresh the page. So just recently upgraded to Windows 7 64 bit on advice from my consultant, but no change. Any ideas anyone?
It sounds like an artifact of your video hardware/driver. Do you have a current driver for your video? Check the video manufacturer's web site for any updates to the drivers.