While I'm using the Clone or History tool suddenly a straight line appears across my picture I'm working on. It's the width of the diamiter of the tip size I'm using at the time. It pops up from anywhere on the work space and connects to my curser where ever I happen to be on my next stroke when I click again. to get rid of it I need to "un do" enough to make it dalete but if working quickly I've lost some work and thus need to redo it. VERY non-productive!! Help!
Could you post a screen shot, so we know exactly what you're referring to?
Could you also give some information about your computer? You could post part of your system information (and REMOVE YOUR SERIAL NUMBER).
Usually, making sure that you installed the latest updates for Photoshop, the Operating System and Graphic card drivers fixes most issues.