Here is my problem: we had issue for making db calls and we released a new version of dll which should use to_date() function to convert string to date for oracle.
I have released new version of dll and it is click once deployed application and all the users got that version.
Somehow one user who has different user settings and preferences for DEV Express Grid somehow is still using old sql query which uses some fixed date (like Aug 12, 2017) which is called when user starts his application.
I checked his temp download folder and can see newer version of dll there.
But this is very annoying as when he makes changes to datatime control it uses new version dll and I can check he references my new release code which is basically used to_date() which is not used in first case.