I installed a WD My Book external hard drive so that I can keep a backup of important files. When I boot my computer Lightroom 3 automatically starts and is at the ADD screen pointing from my WD My Book drive to My Catalog. Is there a way to instruct LR not to look at the WD My Book drive?
Make sure "Show import dialog when a memory card is detected" is unchecked in the General Preferences of LR.
Thank you, that was indeed the problem.