Linking shapes to Access database records

[Barney]

I have been playing around with linking shapes in a Visio drawing to
Access database records, and have managed to get it to do most of what
I want, but the link seems very "fragile", and sometimes I seem to do
something that causes the error message: "cannot find linked record
in database table for shape..." Once I get this I cannot seem to
recover from it.

Has anyone else experienced this and found the cause of the error?

Thanks.