Using a new Logitech pro 9000 webcam. Installed the guvcview app to control it, and can see video there and Sound preferences indicate that the logitech's mic is working. My friends and family are using Gmail video-chat, so I installed the plugin from their site. My machine has 64-bit arch, and LMDE is also 64-bit. Though I installed the debian 64-bit plugin from Google, it initially brought up installation errors. These all seemed to be fixed with "apt-get install -f" When I open Firefox and login to Gmail, the Chat settings DO show that sound is working, and the logitech webcam is detected, but it just shows a black window (no video in Gmail). The webcam is on as is the guvcview software. Not sure how to troubleshoot this? The guvcview controller has a lot of choices. I've done trial and error, but don't really know if I'm barking up the right tree? Any help greatly appreciated.