Very strange bug: After starting an Excel VBA macro, the macro stops and Excel displays a "Code execution has been interrupted" dialog. The only way to get the macro to finish is to keep pressing the "Continue" button. The problem only occurs on my development account not in other accounts. The solution is to wait for the dialog, press the "Debug" button to use VBE then type Ctrl+Break. Apparently, the issue is caused by Excel reactivating breakpoints in the macro from earlier debugging sessions. I guess that is why the macro runs to completion on other accounts. Hat tip to The two WORST Excel Errors EVER.