Moving the cursor using the touchpad inserts "C" This problem happens when I use Parallels (Windows) and Beyond Compare.
When I move the mouse using the touchpad, it will automatically insert C in any place that can input characters.

My OS X is 10.10.5.



Update 2015-12-29
I find when I move the cursor, the Edit will shines, also I imagine C related to copy.
After three months, I finally found reason. The Eudic I installed has function called Zoned word translation. When I open this function, the program will automatically copy text when I use mouse to select it. That will be fine in OS X. But in some application like parallel, it will show this problem.

Solution: cancel this function in the Eudic program setting.