Forum Discussion
GLSU Excel add-in fails to load after Office update from Version 2607 to 2608
Our Excel add-in, Process Runner GLSU , fails to load after Microsoft Office updates from Version 2607 to Version 2608. This started August 17, 2026 and is actively growing in scope.
Error messages:
- Excel: Cannot run the macro 'onLoad'
- VBA: System Error &H80004005 (-2147467259). Unspecified error
- VBA: Compile error in hidden module: ThisWorkbook
Has anyone encountered similar issue with their own custom add-on. If yes, any pointers to fix it.
We are seeking help on priority.
Thanks,
Vrushali Pawale,
Sr. Manager, Insightsoftware.
1 Reply
Hello vrushalipawale,
This points to a VBA compatibility issue in the add-in rather than a general Excel macro issue.
Microsoft documents that “Compile error in hidden module” can occur when VBA code in a protected module cannot compile, including cases where the code is incompatible with the Office version or architecture.
Since the issue started after the update from Version 2607 to 2608, I would check:
- Whether a newer GLSU/Process Runner version is available.
- Whether the affected machines use 32-bit or 64-bit Office and whether the add-in supports that architecture.
- Whether the issue occurs with Excel started in Safe Mode.
- Whether the same add-in works on Version 2607 but fails on Version 2608.
The “Cannot run the macro 'onLoad'” and “Compile error in hidden module: ThisWorkbook” messages also point to the add-in's VBA project failing during its startup process.
Microsoft's documentation on this error:
Compile error in hidden module: <module name>Because the failing code belongs to the third-party GLSU add-in, the vendor should also confirm compatibility with Office Version 2608.
