Singular Matrix in simulink Model: How to find the ill matrix?

In my quite large simulink model I get at some Point of the Simulation the warning:

"Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN."

So I guess some Matrix in my model may get filled with values that either cannot be further treated (such as NaN itself) or that my Matrix is baldy conditioned.

Since I have a multitude of Subsystems with Subsystems in it and many more matrices and I also have some functions that might manage matrices, how can I find the Problem causing spot. Please note that this Problem only occurs at certain occasions and that my Workspace variables are in the hundreds.

[Rebecca Krosnick]

You may want to contact MathWorks Technical Support to investigate this issue.

http://www.mathworks.com/support/contact_us/index.html