When I go to the Google+ app to share a picture I've taken on my phone, it shows the wrong thumbnail. I select the thumbnail anyway because experience has taught me that I can trust the date, and I when I share the picture the correct picture is shared. This is incredibly frustrating, however, as I'm effectively "flying blind" when I share photos with the Google+ app.
I've developed various coping mechanisms for dealing with this problem. I go into the Gallery app and delete all but pictures I want to share on Google+ and count the number of pictures I want to share. Then I select the first few pictures (say, four) and share them on Google+. Even though the thumbnails are wrong because I've already done the legwork to know which picture is which.
I've sent feedback to Google about this multiple times (it bothers me that there is no public record of this) and have been updating the Google+ app regularly, but the problem persists. As of this writing I'm using version 126.96.36.199337 of the Google+ app on Android 2.2.
I don't think this has anything to do with how I manage pictures on my Android phone, but I'll describe that anyway. Every so often I put my phone in USB mode and import my photos into iPhoto. Then (after safely ejecting the device), from the phone I do a "select all" and "delete all" of all the pictures.