draging mouse produces ctrl-c [2]

when I drag Terminal using mouse, it will produce ctrl-c side effect. I don't kown why. note in the attachment photo, I did not key Enter,, I just draged the Terminal, then it produced ctrl-c side effect.

Program Ver. : Xmanager 4
Connect Method : XDMCP connection

This problem may occur if you are using an application that automatically captures selection. For example, dictionary programs are known to do this.

If you are using a such program, please try disabling it and try again.

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Technical Support

thanks, I disable my dictionary program , then the xmanager works well