Baffling behaviour on Form close

[Petrol]

Just ran SFC.
C:\Windows\Syst em32>sfc /verifyonly

Beginning system scan. This process will take some time.

Beginning verification phase of system scan.
Verification 100% complete.

Windows Resource Protection did not find any integrity violations.

[Petrol]

Just ran SFC:
C:\Windows\Syst em32>sfc /verifyonly

Beginning system scan. This process will take some time.

Beginning verification phase of system scan.
Verification 100% complete.

Windows Resource Protection did not find any integrity violations.

[jimatqsi]

Did you upgrade that machine from Access 32-bit to 64-bit?

[Petrol]

The computer was bought in December 2022 with 64 bit 365, and the Access application was recompiled for the 64 bit system.

[Gloryshine]

The issue may stem from corruption in the Access database. Try these steps:

1. Backup your database.
2. Create a new database: Import all objects from the current database into a fresh .accdb file.
3. Check references: Ensure all ActiveX and VBA references are valid and not missing.
4. Review the subform relationship: Recheck the subform's record source and parent/child link properties for errors.
5. Test on another device: See if the issue persists on a different computer.

If the problem continues, a deeper file-level corruption may require a rebuild or use of a recovery tool.

[Petrol]

Thank you, GLoryshine. If you check the history of this topic (especially posts #13 and #15 on 19 and 20 Srptember) you will see that the problem has been reproduced on a completely fresh database, so I have already tried your suggestions. Appreciate your thoughts, though.