The following problems has been fixed with wf31n1up.exe:

1.Access violation in server when checking in workitem.
2.problem during checkout: CHECKOUT_NOT_POSSIBLE
3.activity restarts twice upon failing exit condition and a data is 
  mapped from output to the input container of the activity
4.Instance descriptions are not set properly

Installation
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Unpack the file WF31N1UP.EXE with the following syntax:

wf31n1up /D x:\path (where x:\path is a temporary directory to which
                     the files are unpacked)
                     
Copy the DLL and EXE files into the \BIN directory of your MQ Workflow
installation. The BND files should go to the \BND directory.