If xsibatch hits a runtime error or stops responding, Windows will pop up a dialog box that will sit there until some dismisses it.

On the XSI mailing list last year, Alan Fregman posted an AutoHotKey script that kills Visual C++ Runtime error messages when they pop-up.

AutoHotKey is free, so you could adapt that script to handle other pop-up dialogs, like the XSIBatch.exe has topped working message.

Another possibility would be to set the HKCU\Software\ Microsoft\Windows\Windows Error Reporting\DontShowUI registry key. I haven’t tried it, but I read about it here.

Tip: To test the AutoHotKey script, double-click the .exe to start the AutoHotKey script. You should see an icon in your Windows task bar. Then in Softimage, run this JScript:

XSIUIToolkit.MsgBox( "Runtime Error!" , siMsgOkOnly, "Microsoft Visual C++ Runtime Library");

The pop-up message box should close immediately.

Try exiting the AutoHotKey script (from the task bar). Then run the JScript again.,
Or just change “Runtime Error” to “All is good”, and notice that the message box is not automatically closed.