SecureCRT: emacs hangs when pasting text

[rongchenBioinfo]

I login a linux server from windows using SecureCRT multiple windows, and open Emacs pop-up windows. When I paste text into Emacs, Emcas always hangs. I have been doing this for many year and never had this problem before. Since I got a new laptop and installed new SecureCRT a month ago, my Emacs hangs every time when I paste text, no matter whether I use Ctrl-y or paste from the menu. I am using SecureCRT 6.7.3, Emacs 23.1.1 and Xming 7.5.0.45.