1. There's a hidden sheet in your workbook

2. There is a 2nd instance of M$ Excel in the same process running.

Solution for case 1: Unhide the sheet

Solution for case 2: Every new instance of M$ Excel must run in its own process

I hope, it will help to solve the problem.

Jibala

PDF & BCC (Patience Discipline Focus & Belief Confidence Consistency)