I am using version Adobe Reader X version 10.1 on Windows.
I set the zoom level in Preferences | Page Display | Zoom to 100%. I save it. I close the pdf I am viewing. I reopen the PDF. The PDF is shown at zoom level 72.3 %.
Why is this so hard to get right for Adobe Reader ? This problem has persisted for every version of Adobe Reader I have used since the product was created. This is not rocket science, Adobe developers. Do you think you can get this correct before the end of the earth some X billions of years down the line.
Eddie