Got a strange message today when doing some code changes. I have a group control on a form, but when I right click on the group name in the VBA editor to see the definition, it says that it cannot jump to it because it is in a library that is not currently referenced. It then takes me to the Library list and I can clearly see the grpControl in the library list and it correctly identifies what it is.
The group control is working properly, so I have only discovered this by chance.

I have recompiled, compacted and repaired the database.

Would be interested to know what is causing this. The database was recently converted to Access 365 from Access 2007. The group control has not been changed.