Recently Picasa on Windows 7 has started not detecting photos that are imported from our camera (a Canon S3IS).
When I look in Picasa's folder monitoring options, the folders are there – marked "Scan Once". If I set them to "Scan Always", then they're scanned and the photos appear.
It used to "just work", I don't know what changed.
Best Answer
I don't see what the problem is. If you have the folder set to be scanned once, then that is what will happen. Picasa will scan it once, save the images in it and never scan it again.
What you want, as you yourself state in your question, is to scan always. That way, every time Picasa is opened, it will scan the folder for changes and import any new images it finds.
http://support.google.com/picasa/answer/11511?hl=en :