Hey, this is probably more a problem with my computer than the files themselves, but I could use some help. I purchased the pdf files for Our World and Your Story, and have been trying to read through them. However, lately it seems that my computer has started misreading the text. Some of the words were garbled. I tried restarting the program, but now it is even worse--and some of the fonts are changed now. Does anyone know why this might be happening? I have a Mac, if that might be making any difference.