Simulink crashes using OPC toolbox

Suddenly I have Simulink crashing when I use the OPC toolbox. When I open the OPC config block to "configure OPC clients", simulink gives the following error when I try to add an opc server (below the localhost window):

Configuration: Crash Decoding : Disabled Default Encoding: windows-1252 MATLAB Root : E:\Program Files\MATLAB\R2011a MATLAB Version : 7.12.0.635 (R2011a) Operating System: Microsoft Windows XP Processor ID : x86 Family 6 Model 12 Stepping 10, GenuineIntel Virtual Machine : Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot™ Client VM mixed mode Window System : Version 5.1 (Build 2600: Service Pack 3)

Fault Count: 1

Abnormal termination: Segmentation violation

Register State (from fault): EAX = 00000000 EBX = 2b498e88 ECX = 3183ff9c EDX = 2fe87f18 ESP = 3183fecc EBP = 3183ffb4 ESI = 00000000 EDI = 2b396010

EIP = 2fe7c28c  EFL = 00010246

   CS = 0000001b   DS = 00000023   SS = 00000023
   ES = 00000023   FS = 0000003b   GS = 00000000

Stack Trace (from fault): [ 0] 0x2fe7c28c E:/Program Files/MATLAB/R2011a/toolbox/opc/opc/opcmex.mexw32+00246412 ???+000000 [ 1] 0x7c7db729 E:/WINDOWS/system32/kernel32.dll+00046889 ( GetModuleFileNameA+000442 )

Any suggestions how to fix this? It worked until recently!

[Kaustubha Govind]

I would recommend contacting MathWorks Tech Support about this.