Strange problem. I routinely transfer projects I'm working on between mac and windows and have had no problems until today. I am developing a java desktop application on a Windows XP machine using NetBeans 6.9.1. I transferred the project this morning from my mac to win xp, like always. This time, when I try to run the cleaned and built project, I get a pop up screen that tells me one or more projects were compiled with errors. And when I look at the source tree, sure enough it has the "src" folder marked with that red error icon. However nothing under that folder has the error mark and when I do a clean build, it shows no errors. What is going on?