Hello, I am editing a book manuscript and every chapter or so the cursor disappears, and I can neither write or access any tools in Indesign. The cursor appears in other windows but as soon as I try to switch to InDesign it becomes inaccessible. I can't even use it to close the program, and must reboot the whole system to get access back...for a little while, until it goes again. I use Windows 7 and have CS5. Please advise!