>Do you think that if I ask him to send me the Vfp9rerr.log file the content could be of any help troubleshooting this problem?

Of course: It will help you figure out on which problem to start (unless the error stack is identical from one and the same problem)

>Any other suggestions to try?

Depending on your app and the Errlog it might be helpful to add some simple logging code to your app: If the crash is caused by some .init, you probably won't need logging, but if it is caused by a .refresh (especially after ewad events) it might be helpful to find out if the error is triggered by the same steps/at the same part of loading the app. KISS: activate via environment of file() in data directory to except untroubled machines from logging. If you are lucky, you can identify a specific part where those machines crash regularly always or just when certain prerequisites are met: then you program can perhaps take evasive action<g>.

HTH

thomas