I've had this happen as well. To free up Cakewalk without having to End Task it and lose your work, you can Ctrl+Alt+Delete to Task Manager, right click on the Cakewalk Application and attempt to create a dump file. As the dump file is created it will halt Cakewalk from continuously running and you'll be able to zoom back out and carry on working. You may have to make a dump file more than once to force Cakewalk to stop. Just remember to delete the dump files if you have to do this a few times as they can take up a lot of space.