I have a workbook that uses Application.CalculateFullRebuild and Worksheet.Calculation at various times in the code. it works perfectly well on my PC, and on most of my co-workers. I have 2 colleagues in another office (but on identical hardware & builds) for whom the code stops (without calculating) whenever it reaches these instructions. I have tested with other files and these work perfectly, which confirms the build isn't an issue, just this one file for some people. Has anyone experienced anything similar? Thanks