Odd one this.
My control panel has an event when it loops through a 30,000+ set of records. It has a counter set up so the user can see the percentage done , it takes about 20 seconds. At about 20% (it varies between 15% to 25%) the counter on the control panel will freeze, Access will open a new window showing the purple Access 'key' logo and set focus to it. The program will continue and after a while the report is generated and this new window goes away. All else works, but the counter freezes at whatever %age it was at.
If I try to open the window during this time nothing happens, it can't be opened. It's just visual, but why does it happen? I am in design mode with all the menus available. I haven't tried it with the editors locked out yet.
Any clues please?
 It only updates every 100 loops around the recordset to reduce flicker.