Using Canvas with Connectors

Hi @all,

I am writing a software in c# using .NET-Framework 4.0 drawing flow charts in word. I wanted to use a canvas to place rectangles and connect them.
I was able to place connectors into the canvas. But on some PCs I got a SecurityAccessViolation Exception. I used the same Word 2010 version as on the PCs where my software worked.

Do you know why it works sometimes and sometimes not?

Thanks for you help,
Pascal