Question: I am using Visio professional 2003. It was working fine. But now when I copy and paste any shapes it showing the error "Open clipboard failed". After that I am not able to change any properties or name.

When I try to close the window it is showing warning as "You cant quit visio program because a program is handling an event from visio. If VBA at break point, reset VBA, then quit"

Can anyone tell me what the problem is?

Answer: 
this has been a problem with Visio for 7 years and the last 3 versions of the product([Visio 2003](http://www.dotnet247.com/247reference/msgs/42/214420.aspx) to [Visio 2010](http://social.technet.microsoft.com/Forums/en-AU/visiogeneral/thread/5f3b6b7b-e206-4c9e-b54a-cf430a7cc7ac)). 

The issue happens if you are running some other clipboard manager, like [ditto](http://ditto-cp.sourceforge.net/) or [similar](http://www.techsupportalert.com/best-free-clipboard-replacement-utility.htm#Quick_Selection_Guide). The only thing you can do is use task manager to kill visio, then disable any clipboard manager you are using and restart visio.
On my side the issue was coming from Citrix. Thx for pointing that out Vincent.