After copying text using copy and paste into the chat window and pressing enter to send. The text box will then link you to the system32 folder.
So you paste a link press enter, then when you go to type another message fater pressing enter the text box will open the system 32 folder when you click on it.
Closing the chat window and opening a new one solves the problem.
I am using windows 7 home premium 64bit.
Can also be produced on XP.
I noticed this behaviour with all versions of EVPN i have used and its still doing it in the current beta.