1) Are you having the issue on all pc that have 9.01?

2) Did you upgrade the software that was there or is a uninstall/new install?

3) Is it straight 9.01 or with some fix packs/hot fixes?

You mention this is a custom application - as the user updates the values on the form, are they hard-coded values?

Is there an agent or function that runs to populate the list of values?

@Barry

1. Yes on all PCs that have 9.0.1
2. It is a new install (upgraded the PCs as well)
3. Only IBM Notes Client V9.0.1 (CIQ7REN) is available on IBM site so no host fixes or packs

@Mark

Values are not hard-coded, users need to enter it. The form contains labels and textboxes with Confirm and Cancel buttons.

1) go to IBM's Fix Central site to find the updates to the 9.0.1 Notes client. There have been quite a few, but they are cumulative so you only have to apply the latest one.

2) the developer of the custom app is doing something in the code in between the time the document is saved and the dialog box closes. Whatever is happening at that point is most likely the cause of your crash. You'll need to open up the code to find out what that is. Also, try looking in the client's log.nsf file and the status bar on the bottom of the Notes window to see if the code is writing any diagnostic information in those locations.

hope that helps!

Thanks Stuart, I have applied the fixes but still the same issue.

There are no errors logged in log.nsf and I am not sure on how to access the code of the application. Any suggestions please?

Update - in the status bar below, it shows '0' and then the Notes application quits

If so, what is listed in Thread 1 of 'n'? 

Found the below two files in IBM_TECHNICAL_SUPPORT folder. Please advice.

To look at what the application is doing just before the dialog box closes, you would use the Domino Designer tool. Designer is available from the same place you got the Notes client and is not an extra charge.  It would also be helpful to have some experience with programming in Notes. I'm assuming the original developer is not available? Can you hire a consultant with experience writing Notes applications?

Thanks Stuart, we don't have any costs for that. These are very old apps and we are planning to replace them with .Net but in the meanwhile upgrading the software.

Anyway, one of my old colleague has checked this and asked whether Notes 9 supports Macros or not.

Is there any restriction with Macros in Notes 9?

In general, applications that run on Notes 8 will run on Notes 9 without changes. But it is possible for there to be problems. The only way to know for sure what is going on is to look at the coding in the application.