Why do MATLAB 6.5 (R13) and Simulink 5.0 (R13) hang when I try to update my model with masked subsystems?

Why do MATLAB 6.5 (R13) and Simulink 5.0 (R13) hang when I try to update my model with masked subsystems?

I have two layers of masked subsystems in my model named A and B. B is a subsystem in A, and A is a subsystem in my model. They are both masked. I pass a structure as a parameter to A's mask. I pass individual fields in that structure as parameters to B's mask. I then use these variables in B as parameters to some of the blocks in my B subsystem. When I do this, if I update my model, MATLAB and Simulink hang. If I replace the variables from B's workspace with variables in the MATLAB workspace everything works fine.

Answer 1

[MathWorks Support Team]

This bug has been fixed for Release 14 (R14). For previous releases, please read below for any possible workarounds:

This is a bug in Simulink 5.0 (R13) that is currently under investigation by our development staff.

As a workaround, use variables in your MATLAB workspace instead of variables in your mask workspace when working with nested masked subsystems.