I just created a new test document and saved it with password protection... Closed the file, reopened it, entered the password, and success! It opened. I thought for a moment about what that meant, and didn't really come up with anything. But I immediately went back to my other trouble files and they all opened without issue. For now, I resaved them without any security. I know it's silly, but I'm bothered by Excel's lack of ability to apply a cell indent/margin to the top/bottom of a cell, and don't want to use it for that reason. So, do I permanently eliminate security from the documents I use on-going in OpenOffice to avoid this issue in the future? Or hope that if the problem returns, I can "reset" wherever the problem lies by performing this same sequence? Since this is the second time this has happened, my intellect tells me that it's not the last. I require a password to start and wake my computer, so maybe that's enough.