There appears to be a problem with Bridge CS5.1, or rather, with the Photo Downloader. It doesn't retain settings. I have CS5 and it works fine; my mother has just bought CS5.1 and any settings she enters in the Advanced Dialog disappear each time she exits the Photo Downloader
Chenglong, if you read above, the folder "Bridge CS5.1" is already there with several subfolders and a couple of files, but no matter how many times I've downloaded pictures, the APDPreferences.xml file is NOT created. It's clear it is not being created since all of my settings are lost each time I close the downloader.
Have same issue with Mac OS 10.6.8. Running Elements 9, Lightroom 3 & Photoshop CS5.5 (Bridge 188.8.131.52). Anytime I attempt to select a location to save the intended imported files, photo downloader locks-up and I must do a force quit on the application. There is an existing file . . . 'Bridge CS5' in the Adobe folder as described in earlier posts. The folder contains 8 folders and 4 files.