JIT seems to be associated with Visual Studio, Microsoft .NET, and SQL Server. When an error occurs JIT kicks in where normally you would expect Dr Watson to handle the error debugging. Microsoft have an article on how to re-establish Dr Watson as the default error-handler at http://support.microsoft.com/kb/923827/en-gb.
The relevant section says
You can re-enable the Dr. Watson program to catch unhandled exceptions. After you do this, the Visual Studio JIT debugger will no longer catch unhandled exceptions. To do this, follow these steps:
- Click Start, click Run, type cmd, and then click OK.
- Type the following command, and then press ENTER:drwtsn32 -i
See if that works.
Tom, sorry my suggestions didn't help you a month ago. What operating system and service pack are you using and what version of Internet Explorer is installed? (Regardless of your default browser setting - many processes use it anyway).
You also mentioned last time that paid Technical Support were no help. You can obtain free support using online chat and I believe that some phone support is now free too. If they can't help at the first contact ask them to escalate the issue.
Another thing to try:
Open the registry (use regedit, Click Start, Run, Regedit).
Go to this key:
Double-click it in the right hand pane
And set it to 0.
Close the editor.
(Normally it is set to 0 anyway but something has possibly changed that).