Diagrams locking up

When I have more than one diagram opened sometimes they get locked up. By that I mean that I cannot pick any element in the drawing. I am sure someone has a remedy for this. The only remedy I have is to close all diagrams and restart. Thanks in advance.

I have the same problem. I think this is a Visio problem and AVEVA is going to solve the issue in next fixes.

Hi IS Service Incident Raised to AVEVA?

Here is some notes from AVEVA Diagram Help:
Limitations of Visio Canvas
[TABLE]
[TR]
[TD]•
[/TD]
[TD="width: 100%"]Navigation through Visio Canvas:
[/TD]
[/TR]
[/TABLE]

If there are two diagrams connected through OPC connectors, and you try to navigate from one diagram to another through the OPC the diagram may freeze. This is existing behaviour due to Visio canvas limitations.
The work around to this problem is to close and reopen the frozen document.
[TABLE]
[TR]
[TD]•
[/TD]
[TD="width: 100%"]Vertical Line Segment Breaking through Visio Canvas:
[/TD]
[/TR]
[/TABLE]

In some cases the line segment is not broken the second time if the line segment is placed exactly vertical.
The work around is to make line segment a little horizontal and placing the valves. After placing the valves the line can then be converted back as vertical.